Note: no updates will be able to posted from Monday through Thursday June 1.

Will skies be clear over southern Ontario Sunday night?
Cloudy skies are expected by early evening and overnight, although some regions may have partly clear skies at sunset before skies become overcast.

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are likely by mid-evening over most regions, except for some clouds that may appear occasionally over most regions due to some moisture that is forecast to be over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Friday night?
Partly clear skies are likely, except for some mid-level cloudiness that is likely to appear over most regions, especially southwestern regions, due to some mid and upper-level moisture that is forecast to be over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Monday night?
Mostly cloudy skies are expected, due to lots of mid and upper level moisture, but some breaks in the cloudiness may allow Jupiter and the brighter stars to become visible and cause the impression of partly clear skies occasionaly, especially after midnight.

Will skies be clear Monday night over southern Ontario?
Mostly clear skies are expected, except for some scattered low clouds that may appear occasionally over some or most regions, and except for increasing mid-level cloudiness before morning especially over southwestern regions, due to mid-level moisture (illustrated below for early Tuesday) which is forecast to move over southern Ontario before morning.

Will skies be clear over southern Ontario Sunday night?
Cloudy skies are expected, except for several hours of clearing skies overnight following a cold front and deep mid-and upper-level moisture moving eastward from southern Ontario, and ahead of low-level moisture (illustrated below for late evening and for early Monday) which is forecast to move over southwestern regions during late evening and over regions near GTA early Monday. The gap of partly clearing skies may last for a duration of  few hours.

Will skies be clear over southern Ontario Saturday night?
Mostly cloudy skies are expected, due to mid and upper-level moisture moving over most regions overnight (illustrated below for late evening and early morning) but occasional breaks in the moisture may allow Jupiter and the brighter stars to become visible and give the appearance of partly clear skies especially during early evening.

Will skies be clear over southern Ontario Friday night?

Mostly cloudy skies are expected due to upper-level moisture moving over southern Ontario overnight (illustrated below for late evening) as well as more substantial mid-level moisture over southwestern regions, but the high-level cloud may be thin enough in eastern regions (approximately near, north and east of the GTA) during early evening to allow Jupiter and the brighter stars to be visible and give the appearance of partly clear skies.

Will skies be clear over southern Ontario Thursday night?
Mostly or partly clear skies may develop over most regions by about mid-evening, depending on how much moisture remains in the atmosphere following thunderstorms that may develop, and then cloudy skies are likely before morning due to low-level moisture which is forecast to move southeastward over southern Ontario before morning (illustrated below for early Friday morning).

Will skies be clear over southern Ontario Wednesday night?

Skies might appear to be partly or mostly clear, except that lots of high-level cloudiness will be over most regions most of the time. The illustration below shows high-level moisture over southern Ontario during late evening.

Will skies be clear over southern Ontario Tuesday night?

Partly clear skies are expected, except for some clouds at high, middle and low levels, and fog that may develop in some regions overnight. The illustrations below show regions of high and jetstream-level moisture forecast to be over southern Ontario Tuesday night.

Will skies be clear over southern Ontario Monday night?

Clear skies are expected during the evening, before moonrise, and then increasing high-level cloudiness is expected, due to upper and mid-level moisture (illustrated below for late evening) spreading across most of southern Ontario ahead of Tuesday’s warm front.

Will skies be clear over southern Ontario Sunday night?
Mostly clear skies are expected except for some low-level cloudiness over some regions during the evening, until low-level moisture (illustrated below for late evening) moves southward from southern Ontario by or after midnight.

Will skies be clear over southern Ontario Saturday night?
Mostly cloudy skies are expected until a weak low pressure trough moves eastward from southern Ontario after midnight, and then partly clearing skies are likely over most regions, except for mostly clear skies in southwestern regions by morning twilight. The illustration below shows the position of mid-level moisture at morning twilight.

Will skies be clear over southern Ontario Friday night?
Clear skies are expected over southwestern regions and regions near Lake Huron, while cloudy skies are expected over and near and north of regions near eastern Lake Erie and Lake Ontario, due to moisture (illustrated below for late evening) and cloud associated with a low pressure trough over southern Ontario.

Will skies be clear over southern Ontario Thursday night?

Mostly clear skies are expected, except for some occasional mid and low level clouds near the GTHA and the region between western Lake Erie and Georgian Bay, due to some mid and low-level moisture over this region (illustrated below for late evening).

Will skies be clear over southern Ontario Wednesday night?

Mostly cloudy skies are likely by late evening, due to widespread mid-level moisture (illustrated below for late evening), except for occasionally partly cloudy skies where breaks in the moisture allow bright moonlight to be visible and give the impression of clear skies. The first hour of darkness is more likely to be partly clear, followed by increasing cloudiness.

Will skies be clear over southern Ontario Tuesday night?

Lots of cloudiness will appear over southern Ontario, due to lots of mid-level moisture (illustrated below for late evening) but occasional clear breaks may allow bright moonlight to appear and cause skies to appear partly clear occasionally over most regions.

Will skies be clear over southern Ontario Monday night?

Clear skies are expected over southwestern regions and mostly cloudy skies are expected over regions near, north and east of the GTHA due to mid-level moisture (illustrated below for late evening) circulating around a low pressure region east of Ontario.

Will skies be clear over southern Ontario Sunday night?
Mostly clear skies are expected over most regions, except for eastern regions of southern Ontario including the GTHA area, where moisture (illustrated below for late evening) rotating around a low pressure region east of Ontario will cause cloudiness near and approximately north and east of the Toronto area. Over southwestern Ontario, some clouds are likely to be visible occasionally during the evening and mostly clear skies are likely after midnight.

Will skies be clear over southern Ontario Wednesday night?
Partly clear skies are expected with lots of high-level clouds, caused by increasing jetstream-level moisture and a jetstream over southern Ontario overnight (illustrated below for early evening).

Will skies be clear over southern Ontario Tuesday night?

Cloudy skies are expected over all regions, due to extensive low-level moisture over southern Ontario, except for occasional breaks that may appear in the cloud cover from time to time (especially before morning) and allow moonlight to appear (during the evening before the moon sets) and give the impression of clearing skies.