Will skies be clear over southern Ontario Friday night?
Partly or mostly clear skies are likely over southwestern regions, following some cloudiness during the evening, while mostly cloudy skies are expected over most other regions, caused by widespread low-level moisture, except that skies could occasionally become partly or mostly clear over regions where gaps develop in the moisture, especially before morning.

Will skies be clear over southern Ontario Tuesday night?

Mostly cloudy skies are expected, mainly due to widespread jetstream-level moisture over southern Ontario overnight (illustrated below for late evening) as well as some low-level moisture over some regions, except that partly clear skies may develop over some southwestern regions where gaps in the high cloud could allow skies to occasionally become partly or mostly clear.

Will skies be clear over southern Ontario Monday night?

Mostly cloudy skies are expected during the evening, due to lots of low-level moisture (illustrated below for early evening) as well as lots of jetstream-level moisture causing high cloud overnight, followed by clearing skies later in the evening (except for the widespread high cloud remaining over most regions overnight).

Will skies be clear over southern Ontario Sunday night?
Clear skies are expected, except for some thin high cloud that may appear later in the evening and after midnight over some regions, caused by jetstream-level moisture which is forecast to move across southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected during the evening, and then high cloudiness may appear over many regions after about midnight, as well as low cloud and mist that may develop over some regions before morning.

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are likely, due mainly to a high cloud deck, but partly clear skies could develop occasionally over some regions where thinner gaps in the high-level moisture allow stars to become visible and give the impression of partly clear sky.

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are likely over most regions, due to extensive low-level moisture and cloud, except for partly clear skies that may develop over some regions occasionally.

Will skies be clear over southern Ontario Wednesday night?
Mostly clear skies are likely over many regions, except that periods of cloudiness are likely over regions south and east of Lake Huron and Georgian Bay, caused by extensive low-level moisture flowing southeastward from the lakes (illustrated below for late evening).

Will skies be clear over southern Ontario Tuesday night?

Mostly clear skies are likely during some of the evening over some regions near Lake Erie and western Lake Ontario where atmospheric moisture diminishes (illustrated below for mid-level moisture). Otherwise, lots of low and mid-level moisture is likely to cause mostly cloudy skies.

Will skies be clear over southern Ontario Monday night?
Mostly cloudy skies are likely, due to lots of mid and high-level moisture, except for partly clear skies occasionally over some regions where the high cloud diminishes enough for stars to be visible.

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are expected, except for partly or mostly clear skies that may develop occasionally over some regions where the low cloud diminishes and allows stars and the bright gibbous moon (after moonrise) to appear.

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are expected, due to lots of high clouds, but skies may become mostly clear for several hours during late evening and around midnight over regions north of Lake Erie where mid and high-level moisture diminishes before increasing again before morning (illustrated in the total cloud cover chart shown below).

Will skies be clear over southern Ontario Wednesday night?

Mostly clear skies are expected, except for some scattered low cloudiness that may appear especially over regions east of Lake Huron and Georgian Bay.

Will skies be clear over southern Ontario Tuesday night?

Partly clearing skies are expected over most regions, except for lots of cloudiness over regions south and east of Lake Huron and Georgian Bay, especially during the evening (illustrated below with low-level moisture during early evening). Less cloudiness is likely later in the night as winds back to southwesterly and lake-effect cloudiness diminishes over regions south of the lakes.

Will skies be clear over southern Ontario Saturday night?
Partly or mostly clear skies are likely over some regions during the evening, except for occasional cloudiness over some regions due to varying amounts of low and mid-level moisture that is forecast to move over southern Ontario, and then increasing high-level cloudiness is expected especially after midnight.

Will skies be clear over southern Ontario Friday night?

Partly clear skies are likely with lots of lake-effect cloudiness over regions south and east of Lake Huron and Georgian Bay.

Will skies be clear over southern Ontario Wednesday night?

Mostly cloudy skies are expected, due to lots of moisture flowing southeastward from Lake Huron and Georgian Bay, except that clear breaks may develop occasionally over some regions and allow stars to appear and give the appearance of clear sky.

Will skies be clear over southern Ontario Monday night?

Clear skies are expected over most regions, except for southwestern regions where moisture flowing southward from Lake Huron (illustrated below for early evening) will maintain mostly cloudy skies over those regions, and except for some low clouds remaining over some regions for several hours after sunset.

Will skies be clear over southern Ontario Saturday night?
Partly or mostly clear skies are likely occasionally over regions, near, north and east of western Lake Ontario during the evening, but lots of high-level cloudiness will likely be passing over southern Ontario and the periods of clear sky will probably be temporary. Otherwise, for the rest of southern Ontario, mostly cloudy skies are likely.

Will skies be clear over southern Ontario Thursday night?

Clear skies are expected over most regions during the evening, except for increasing high cloudiness beginning over southwestern regions during the evening, caused by high-level moisture which is forecast to move eastward over southern Ontario overnight (illustrated below for Thursday evening).

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are expected, due to high-level moisture which is forecast to move eastward over southern Ontario overnight, except for locations near, north and east of western Lake Ontario where skies may be mostly clear during the early evening before the high-level moisture moisture moves eastward. Some low clouds may cause partly cloudy skies over the regions near western Lake Ontario before the high-level moisture moves over these regions.

Will skies be clear over southern Ontario Friday night?
Mostly clear skies are expected over southwestern regions, and partly cloudy skies are likely during the evening over regions south and east of Lake Huron and Georgian Bay, due to lots of low-level moisture flowing southeastward from the lakes (illustrated below for early evening).

Will skies be clear over southern Ontario Wednesday night?

Partly clear skies are likely over most regions, except for some regions where skies may be mostly cloudy with extensive low cloud cover (caused by low-level moisture, illustrated below for early evening), and except for fog that will likely be developing over many regions where skies become partly or mostly clear, and except for increasing high cloudiness before morning.

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are likely, except for partly clear skies with lots of high clouds near Lake Ontario during the evening, until increasing mid and high-level moisture (illustrated below for late evening) moves northeastward over the western Lake Ontario area and causes skies over those regions to become mostly cloudy by about midnight.

Will skies be clear over southern Ontario Saturday night?
Partly clear skies are expected, except for lots of high clouds, and except for low cloud spreading westward from western Lake Ontario and western Lake Erie during the evening.

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are expected during the early evening until low-level moisture (illustrated below for early evening) moves south of Ontario and then clearing skies are expected later in the evening and overnight.

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are expected, due to extensive low-level moisture and cloudiness, but some clear periods are likely occasionally over some regions.

Will skies be clear over southern Ontario Tuesday night?

Mostly clear skies are expected over southwestern regions south of Lake Huron, and partly or mostly cloudy skies are likely over most regions southeast of Lake Huron and Georgian Bay, caused by lots of low-level moisture from the lakes that will likely be causing cloudy periods over many regions (illustrated below for Tuesday evening).

Will skies be clear over southern Ontario Friday night?
Mostly clear skies are likely during the evening, followed by increasing cloudiness by or after midnight as upper-level moisture moves eastward over southern Ontario beginning before midnight over southwestern regions (illustrated below for mid-evening).

Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are likely, except for lots of cloudiness over regions south and east of Lake Huron and Georgian Bay caused by lots of low and mid-level moisture (illustrated below for mid-evening) especially before midnight, and then mostly clear skies are likely before morning.

Will skies be clear over southern Ontario Tuesday night?
Partly clear skies are expected, with varying amounts of cloudiness caused by lots of low-level moisture, especially over regions east of Lake Huron and Georgian Bay (illustrated below for mid-evening).

Will skies be clear over southern Ontario Saturday night?
Mostly cloudy skies are expected, except for occasional clearing breaks later in the evening and during early morning as low and mid-level cloudiness gradually moves eastward from southern Ontario overnight.

Will skies be clear over southern Ontario Monday night?

Clear skies are expected until high cloudiness gradually increases, beginning near sunset over southwestern regions and near or after midnight near western Lake Ontario, caused by jetstream-level moisture which is forecast to spread eastward over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Sunday night?
Clearing skies are expected, with skies clear over southwestern regions during the evening, cloudy skies near western Lake Ontario, and skies gradually clearing from west to east as low-level moisture (illustrated below for late evening) gradually moves eastward overnight.

Will skies be clear over southern Ontario Friday night?

Mostly clear skies are expected, except for cloudiness during the evening over regions near, north of and east of western Lake Ontario until low-level moisture  (illustrated below for early evening) moves eastward later in the evening, and except for increasing high (jetstream-level cirrus) cloudiness that may appear over southwestern regions before morning.

Will skies be clear over southern Ontario Thursday night?

Partly clear skies are likely, except for lots of high cloudiness caused by jetstream-level moisture over southern Ontario overnight (illustrated below for late evening) along a strong jetstream which is over southern Ontario during Thursday.

Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are expected, due to lots of low cloud, except for regions near Lakes Erie and  Ontario, where skies may become partly or mostly clear for several hours or more.

Will skies be clear over southern Ontario Sunday night?
Mostly clear skies are expected, except for occasional low clouds (and possibly fog before morning) over some regions, and except for increasing high cloudiness before morning.

Will skies be clear over southern Ontario Saturday night?
Partly or mostly clear skies are expected, except for lots of high cloudiness caused by varying amounts of high-level moisture forecast to be over southern Ontario overnight (illustrated below for early evening).

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are expected, except for mostly clear skies over southwestern regions.

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are expected, with some scattered clouds that may appear occasionally over most regions.

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are expected over most regions, except for regions near Lakes Erie and Ontario where skies are likely to be partly or mostly clear for several hours during early evening, until widespread cloudiness spreads eastward over all regions by late evening.

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected, except for some low-level clouds that may appear occasionally over some or most regions.

Will skies be clear over southern Ontario Friday night?

Mostly cloudy skies are expected, except for partly clear skies (with lots of high cloud) near and east of western Lake Ontario during the first several hours of the evening, until cloudiness moves eastward over all regions.

Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are expected over most regions, except for increasing high cloudiness over southwestern regions, caused by high-level moisture which is forecast to move eastward over southwestern Ontario (illustrated below for late evening).

Will skies be clear over southern Ontario Monday night?
Clear skies are expected. Some low clouds may appear, caused by some low-level moisture which is forecast to be over southern Ontario during the evening (illustrated below for late evening).

Will skies be clear over southern Ontario Sunday night?

Mostly cloudy skies are expected, except for partly clear skies near western Lake Ontario during early evening, until high-level moisture (illustrated below for late evening) moves northeastward over this region (and most regions) and causes mostly cloudy skies by about mid-evening.

Will skies be clear over southern Ontario Monday night?

Partly clear skies are likely over most regions during the evening, except for varying amounts of clouds caused by low-level moisture which is forecast to be over southern Ontario overnight (illustrated below for early evening) and then fog or mist are likely to develop later in the evening or overnight over some regions. 

Will skies be clear over southern Ontario Thursday night?

Clear skies are expected, except for some high-level cloud that may appear occasionally over some regions, due to jetstream-level moisture (and a strong jetstream) over southern Ontario.

Will skies be clear over southern Ontario Tuesday night?

Mostly clear skies are expected, except for some cloudiness during early morning over some regions, caused by some low-level moisture and jetstream-level moisture which are forecast to move over southern Ontario after midnight (illustrated below for early Wednesday).

Will skies be clear over southern Ontario Monday night?
Mostly cloudy skies are expected, due to extensive low-level moisture (illustrated below for late evening) but some breaks in the cloud cover could develop briefly and allow skies to appear partly clear.

Note: no updates will be posted until Monday, September 23.

Clear skies!

Will skies be clear over southern Ontario Wednesday night?
Mostly clear skies are expected, except for some mid and high-level cloudiness over regions south of Georgian Bay and north of western Lake Ontario, caused by mid-level moisture which is forecast to be over those regions (illustrated below for late evening).

Will skies be clear over southern Ontario Tuesday night?
Mostly clear skies are expected, except for some high clouds that may occasionally be visible over most regions, caused by mid-level moisture which is forecast to be over southern Ontario (illustrated below for early evening).

Will skies be clear over southern Ontario Monday night?

Mostly clear skies are likely over most regions, except for lots of cloudiness remaining over southwestern regions, and except for high cloudiness that will be over most regions, caused by jetstream-level moisture which is forecast to be over southern Ontario overnight (illustrated below for early Tuesday).

Will skies be clear over southern Ontario Friday night?

Clearing skies are expected by late evening in southwestern regions as cloudiness moves eastward from most regions overnight, except for regions near western Lake Ontario where the cloudiness may take until sunrise to move eastward.

Will skies be clear over southern Ontario Thursday night?

Mostly clear skies are expected over most regions, except for some cloudiness over southwestern regions, caused by mid-level moisture over southwestern Ontario overnight (illustrated below for early evening) and except for some high clouds that may appear over most regions overnight, due to jetstream-level moisture over most of southern Ontario.

Will skies be clear over southern Ontario Monday night?

Partly cloudy skies are expected, due to widespread high clouds over most regions caused by jetstream-level moisture (illustrated below for late evening) and some cloudiness caused by mid-level moisture especially over southwestern regions (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?

Mostly cloudy skies are expected, due to lots of low-level moisture (illustrated below for late evening), except for partly clear skies near Lake Ontario with lots of high cloudiness due to widespread jetstream-level moisture (illustrated below for late evening).

Will skies be clear over southern Ontario Friday night?

Mostly cloudy skies are expected, except for partly clear skies that could occasionally appear over some regions where breaks in the cloud cover develop.

Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are expected during the evening, except for some mid-level clouds that may appear over some regions, and then increasing cloudiness is likely by about midnight as moisture and cloudiness moves eastward over most regions before morning (illustrated below for mid-level moisture around late evening).

Will skies be clear over southern Ontario Wednesday night?

Mostly clear skies are expected over most regions, except for regions south of Lake Huron and Georgian Bay, where some cloudiness is likely to persist during most of the evening, caused by low-level moisture flowing southward from the lakes (illustrated below for early evening).

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are expected during the evening, except for some early-evening clouds caused by mid-level moisture which is forecast to move eastward from southern Ontario during the evening (illustrated below for early evening), and then low clouds and fog may develop after midnight over many regions.

Will skies be clear over southern Ontario Friday night?

Mostly clear skies are expected, except for some high-level clouds that might be visible occasionally, due to jetstream-level moisture and a strong jetstream which is forecast to be over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Thursday night?
Skies may be mostly clear during early evening over southern and eastern regions, but cloudiness ahead of a cold front is forecast to move eastward over southern Ontario overnight and so regions near Lake Ontario may remain reasonable clear during most of the evening, while regions near Lake Huron are likely to be mostly cloudy by sunset.

Will skies be clear over southern Ontario Wednesday night?

Partly clear skies are likely over some regions some of the time, especially during the evening, otherwise mostly cloudy skies are likely over most regions, due to lots of mid-level moisture which is forecast to move over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Tuesday night?

Clearing skies are expected over southwestern regions by sunset or early evening, but skies near and north of western Lake Ontario may remain cloudy until early morning or sunrise.

Will skies be clear over southern Ontario Thursday night?
Clear skies are expected, except for some low clouds that may appear occasionally over some regions due to some low-level moisture remaining over southern Ontario.

Note: no further updates will be posted until Sunday August 25.
Clear skies!

Will skies be clear over southern Ontario Wednesday night?
Cloudy skies are expected before midnight, followed by gradually clearing skies by morning with patches of clearing skies mixed with patches of low cloud.

Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are expected, except for partly clear skies with lots of high cloud during early evening over many regions until more moisture and cloudiness moves eastward over southern Ontario later in the evening.

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are expected, except for some clouds that may appear occasionally over southwestern regions, due to a region of moisture which is forecast to be over southwestern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected, except for some high cloud caused by jetstream-level moisture which is forecast to move over southern Ontario overnight (illustrated below for late evening) and except for high humidity and extensive low-level moistute causing fog in some regions.

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are expected, due to lots of mid-level moisture (illustrated below for late evening), except for regions near and north of the GTA, where skies are likely to be mostly clear for several hours during the evening as a gap in the moisture moves eastward across the area.

Will skies be clear over southern Ontario Thursday night?
Partly or mostly cloudy skies are likely over most regions during the evening, due to lots of mid-level moisture which is forecast to move over southern Ontario during the evening (illustrated below for late evening) and then mostly clear skies are likely during early morning after the mid-level moisture moves east from southern Ontario.

Will skies be clear over southern Ontario Wednesday night?

Partly or mostly clear skies are likely over most regions, with periods of cloudiness at times, due to mid-level moisture which is forecast to be over southern Ontario overnight (illustrated below for late evening) and with enough periods of mostly clear sky to allow the full moon to be easily visible and give the impression of clear sky.

Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are likely, due to lots of mid-level moisture available (illustrated below for late evening) as well as some high cirrus cloud, but enough clear breaks may exist over many regions to occasionally result in the nearly full moon being brightly visible and giving the impression of a mostly clear sky.