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.