Will skies be clear over southern Ontario Saturday night?
Clear skies are expected except for some high cloud that may appear over regions near, north of and east of western Lake Ontario during the evening, caused by a region of jetstream-level moisture which is forecast to be over the area during the evening (illustrated below for late evening).

Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are expected (except for some low clouds that may appear occasionally).

Will skies be clear over southern Ontario Monday night?
Clear skies are expected, except for some high, thin cirrus cloud that might occasionally appear under the bright moonlight, due to a high-level jetstream above southern Ontario.

Will skies be clear over southern Ontario Sunday night?
Mostly clear skies are expected over most regions, except for some cloudiness during the evening over regions generally north and east of Toronto, due to low and mid-level moisture (illustrated below for late evening) remaining over those areas until moving southeastward later in the evening.

Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are expected, except for some high cloud that may appear over most regions due to jetstream-level moisture which is forecast to gradually move northeastward over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Wednesday night?

Clearing skies are expected during the evening and overnight as significant mid-level moisture gradually moves southward from southern Ontario overnight (illustrated below for Wednesday night and early Thursday).

Will skies be clear over southern Ontario Tuesday night?
Partly clear skies are expected over eastern parts of southern Ontario, due to lots of upper-level moisture (illustrated below for late evening) while mostly cloudy skies are likely over southwestern regions.

Will skies be clear over southern Ontario Sunday night?
Partly clear skies are expected, due to widespread high clouds caused by lots of jetstream-level moisture which is forecast to be over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?
Partly cloudy skies are likely, due to extensive high cloud drifting eastward from thunderstorms over the western Great Lakes region (and can be seen below on the mid-afternoon visible satellite image) and illustrated on the forecast chart below (for Saturday evening) although the high cloud will occasionally be thin enough over various regions to allow skies to appear mostly clear.

Will skies be clear over southern Ontario Friday night?

Skies are likely to remain cloudy over southwestern regions overnight, and clear over easternmost regions of southern Ontario (generally near, north of and east of GTA) and partly cloudy to varying degrees over other regions, due to some mid-level and upper level moisture which is forecast to be over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Thursday night?
Clear skies are expected, except for some scattered mid-level clouds over some regions caused by a region of mid-level moisture which is forecast to move southward over southern Ontario overnight (illustrated below for early Friday).

Will skies be clear over southern Ontario Wednesday night?
Clear skies are expected, following Wednesday afternoon's cold front, except for some low clouds that could appear occasionally, due to clouds remaining after development and then dissipation of thunderstorms.

Will skies be clear over southern Ontario Monday night?
Clear skies are expected, except that regions near, north and east of Toronto may have some scattered  high cloud appear occasionally during the first half of the night until some jetstream-level moisture moves south of the province.

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are expected over most regions, due to widespread high cloud that is over southern Ontario during Sunday afternoon, but some regions near the northern edge of the cloud shield may occasionally have thin high cloud that will allow the brighter stars and planets to be visible and cause the appearance of partly or mostly clear skies.

Will skies be clear over southern Ontario Friday night?
Partly or mostly clear skies are likely, except for lots of high cloud due to high-level moisture which is forecast to be over southern Ontario (illustrated below for late evening).

Will skies be clear over southern Ontario Thursday night?
Clear skies are expected, except for some high cloud that may appear after midnight over most regions, due to jetstream-level moisture which is forecast to move over southern Ontario early Friday (illustrated below for early Friday).

Will skies be clear over southern Ontario Tuesday night?
Partly clear skies are expected due to lots of low-level clouds over most regions caused by moisture which is forecast to be over southern Ontario (illustrated below for late evening) during most of the night.

Will skies be clear over southern Ontario Monday night?
Mostly cloudy skies are expected over most regions, due to lots of mid-level moisture during the evening (illustrated below for late evening) until a weak cold front moves southward across southern Ontario and then less cloudiness is likely by early morning.

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected, except for some scattered low clouds that may appear due to some low-level moisture which is forecast to be over southern Ontario (illustrated below for late evening).

Will skies be clear over southern Ontario Friday night?
Partly cloudy skies are expected due to lots of low cloudiness caused by low-level moisture (illustrated below for early Saturday) but breaks in the cloud may cause skies to occasionally become partly or mostly clear over most regions.