Will skies be clear over southern Ontario Thursday night?
Clear skies are expected over most regions, except for high cloud that is likely to spread northward over southwestern regions before morning caused by the leading band of high cloud ahead of the remnant of ex-hurricane Harvey (illustrated below for early Friday morning).

Will skies be clear over southern Ontario Wednesday night?
Partly or mostly clear skies are expected for several hours during the evening over most regions, after daytime clouds diminish after sunset and before widespread low-level and mid-level moisture moves southward over southern Ontario around midnight (illustrated below for late evening).

Will skies be clear Tuesday night over southern Ontario?
Skies are likely to appear mostly cloudy during the evening due to lots of mid-level and jetstream-level moisture (illustrated below for late evening) which is forecast to gradually diminish by early Wednesday. The moon and brighter planets and stars may be visible during the evening and give the impression of clear skies in some regions where cloud cover becomes thin.

Will skies be clear over southern Ontario Sunday night?
Skies are likely to appear mostly cloudy due to increasing high and mid-level cloudiness, although the moon and brighter stars and planets may be visible and give the impression of partly clear skies during the evening.

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected except for increasing high cloudiness over southwestern regions by sunset and during early evening, caused by high-level moisture which is forecast to spread eastward over southern Ontario overnight (illustrated below for late evening).

Friday night: clear skies are expected (except for smoke aloft).

Will skies be clear over southern Ontario Thursday evening?
Mostly clear skies are likely over most regions, except for some mid-level cloudiness during the evening over regions from the GTHA westward and north of Lake Erie, due to mid-level moisture which is forecast to be over these regions during the evening (illustrated below on the charts for 500 and 700 hPa levels). Also, some jetstream-level clouds may be visible over most regions, due to the jetstream south of Ontario and jetstream-level  moisture moving over most of southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Wednesday night?

Skies are likely to be partly or mostly clear during the evening, except for lots of high clouds and except for a region of low-level cloudiness during the evening north of western Lake Ontario, due to a region of low-level moisture which is forecast to move eastward across the region during the evening (illustrated below for late evening), followed by gradually increasing high cloudiness after midnight ahead of Thursday’s warm front.

Will skies be clear over southern Ontario Tuesday night?

Clear skies are expected following some early-evening clouds that will be dissipating during twilight, except for some high clouds that may appear overnight over some regions, due to jetstream-level moisture which is forecast to move over southern Ontario overnight (illustrated below for early Wednesday morning) as the jetstream moves eastward from southern Ontario.

Will skies be clear Monday night over southern Ontario?
Mostly cloudy skies are expected, due to lots of mid and high-level moisture in the atmosphere over southern Ontario, but skies may occasional appear to be clear enough for the brighter stars to be visible over most regions sometime during the night.

Will skies be clear Sunday night over southern Ontario?
Mostly clear skies are likely, except for high clouds that may occasionally appear, due to the jetstream over southern Ontario and some moisture at jetstream level which is forecast to be over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?

Mostly cloudy skies are likely during the evening, followed by clearing skies overnight, due to extensive mid-level moisture which is forecast to be over southern Ontario during the evening (illustrated below for late evening) and to move south of Ontario before morning.

Thursday night, mostly cloudy skies are expected over southern Ontario as a result of widespread high clouds, although the high cloudiness may occasionally be thin enough to allow skies to appear partly clear, especially with bright moonlight appearing after moonrise.

Will skies be clear over southern Ontario Wednesday night?

Partly clear skies are expected, after the leftover cloud from afternoon thunderstorms diminishes during the early evening, except for lots of high thin cloud that may appear occasionally over most regions, caused by jetstream-level moisture that will be over southern Ontario (illustrated below along with the position of the jetstream during late evening).

Will skies be clear over southern Ontario Tuesday night?

Mostly clear skies are expected except for occasional mid-level clouds likely to appear, due to mid-level moisture which is forecast to move across southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Monday night?
Clear skies are expected over most regions, except for partly cloudy skies during the evening over regions near Lakes Erie and Ontario, followed by clearing skies by late evening as cloudiness and moisture along a weak trough gradually move southeastward from southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected after early-evening mid-level cloudiness diminishes, except for some high clouds that may appear over southwestern regions, caused by jetstream-level moisture which is forecast to move eastward over southern Ontario overnight (illustrated below for early Sunday, after midnight). The illustration below for mid-level moisture (700 hPa level) shows the moisture which is forecast to move across southern Ontario around sunset and early evening and be mostly east of southern Ontario by late evening.

Will skies be clear over southern Ontario Friday night?

Partly cloudy skies are expected overnight, except for mostly clear skies during the evening over some regions near and north of GTA, following Friday afternoon's cold front, and then partly cloudy skies are expected later in the evening and overnight, due to lots of mid-level moisture forecast to remain over most of southern Ontario (illustrated below for late evening).

Will skies be clear over southern Ontario Wednesday night?
Mostly cloudy skies are likely, due to lots of mid and high-level moisture forecast to move aver southern Ontario, but skies may occasionally appear to be partly clear with bright moonlight giving the impression of clear skies.

Will skies be clear over southern Ontario Tuesday night?

Generally clear skies are expected, except for some mid or high-level clouds that may appear over some regions during the evening, due to cloud and moisture remaining from afternoon cloudiness, as well as some mid-level moisture (illustrated below for late evening).