Will skies be clear over southern Ontario Saturday night?
Skies are likely to be cloudy over southwestern regions and mostly clear over regions near Georgian Bay and Lake Ontario during the early evening, and then become cloudy later in the evening or after midnight, due to mid-level moisture which is forecast to move eastward over southern Ontario during the evening (illustrated below for early evening).

Will skies be clear over southern Ontario Thursday night?
During the evening, mostly clear skies are expected over some regions except for regions near eastern Lake Erie and Lake Ontario, where high cloud will be visible until high-level moisture moves eastward from southern Ontario later in the night (illustrated below for late evening). During early morning, more high cloud is likely to move eastward over most of southern Ontario, caused by high-level moisture (illustrated below for early morning). Low clouds are also possible to appear over most regions overnight.

Will skies be clear over southern Ontario Wednesday night?

Mostly clear skies are expected, except for some clouds that may appear occasionally, caused by low-level moisture remaining over southern Ontario (illustrated below for late evening) following Wednesday’s cold front, as well as some high, thin jetstream-level clouds that may appear over southern regions of southern Ontario (close to Lakes Erie and Ontario) due to jetstream winds over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?
Clear skies are expected, except for some high cloud over regions north of Lake Erie during early evening, until jetstream-level moisture (illustrated below for early evening) moves south from southern Ontario.

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are expected during the evening (due to lots of low-level moisture remaining over southern Ontario), along with occasional clear breaks, and then gradually clearing skies are expected later in the night and early morning as the moisture moves southward from southern Ontario.

Will skies be clear over southern Ontario Wednesday night?

Mostly clear skies are expected during the evening, except for some low clouds that may appear occasionally, and then increasing high cloudiness is expected later in the night.

Will skies be clear over southern Ontario Tuesday night?
Partly clear skies are expected, but lots of low-level clouds, as well as some mid-level and high cloudiness will likely be visible in the moonlight, due to lots of jetstream-level moisture over southern Ontario (illustrated below for late evening).

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are expected, except for some high cloud due to jetstream-level moisture over regions near Lakes Erie and Ontario during the evening (illustrated below for early evening) and except for some low clouds that are likely to appear occasionally, and fog forming over some regions, due to very humid air over southern Ontario.

Will skies be clear over southern Ontario Sunday night?
Mostly clear skies are expected over most regions, but some low cloud may appear, especially after midnight, and fog may also develop, due to very humid and moist air over southern Ontario.

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected over most regions, but lots of low cloud may appear, especially after midnight, and fog may also develop, due to very humid and moist air over southern Ontario.

Will skies be clear over southern Ontario Friday night?
Mostly or partly clear skies are expected during the evening, but lots of low cloud may appear, especially after midnight, and fog may also develop, due to very humid and moist air over southern Ontario.

Will skies be clear over southern Ontario Thursday night?
Mostly or partly clear skies are expected during the evening, but lots of low cloud may appear, especially after midnight, and fog may also develop, due to very humid and moist air over southern Ontario.

Will skies be clear over southern Ontario Wednesday night?
Skies are likely to be mostly clear over most regions before midnight, except for some areas of low cloud, and then more low cloud and fog is likely to develop after midnight due to lots of low-level humidity over southern Ontario.

Will skies be clear over southern Ontario Tuesday night?
Mostly clear skies are expected during the evening, except for some low-level cloud that may be over eastern regions of southern Ontario (generally near the GTA) during early evening, and except for low cloud and fog that is likely to develop over many regions of southern Ontario after midnight and before morning.

Note: no forecast updates will be posted until September 9.
Clear skies!

Will skies be clear over southern Ontario Tuesday night?
Generally clear skies are expected by the end of twilight, except for lots of high cloud that may be visible occasionally, and then fog may form in many locations overnight.

Will skies be clear over southern Ontario Monday night?

Partly clear skies are expected with lots of clouds over some regions due to lots of moisture at high, mid and low levels of the atmosphere (mid-level moisture forecast chart illustrated below for late evening) but fog is likely to form later in the night where winds become calm and over locations where rain falls during Monday afternoon.

Will skies be clear over southern Ontario Sunday night?
Partly clear skies are expected due to lots of low-level moisture causing some low clouds overnight, but lots of high cloud is also expected due to jetstream-level moisture, except for early evening over regions near western Lake Ontario and eastern Lake Erie, where less jetstream-level moisture is expected (illustrated below for early and late evening).

Will skies be clear over southern Ontario Saturday evening?
Skies may be partly clear during the evening over many regions, but lots of high cloud will be present, as well as other low and mid-level clouds, so that the planets and brighter stars could be visible and give the impression of clear skies.