Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are expected, due to lots of moisture at all levels, except for brief periods of mostly clear sky that could develop over some or most southern regions especially during early evening. The illustration below shows the forecast location of mid-level moisture during the early evening.

Will skies be clear over southern Ontario Saturday night?
Mostly cloudy sies are expected, except for mostly clear skies near, north and east of the GTA during the early evening, and then cloudiness is forecast to spread eastward across those regions by late evening. (The charts below illustrate the low and mid-level moisture during mid-evening.)

Will skies be clear over southern Ontario Friday night?

Mostly cloudy skies are likely, due to lots of low-level moisture which is forecast to be over southern Ontario overnight (illustrated above for early evening), except for some breaks in the low overcast which may appear occasionally during the evening, especially near Lake Erie and western Lake Ontario.

Will skies be clear over southern Ontario Wednesday night?
Mostly cloudy skies are likely over most regions due to lots of low-level moisture (illustrated below for mid-evening) and then increasing high cloud before morning, but skies could become partly or mosttly clear occasionally over some regions.

Will skies be clear over southern Ontario Monday night?

Partly clear skies are likely to develop over some regions, but mostly cloudy skies are likely most of the time over many 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 mid-evening).

Will skies be clear over southern Ontario Saturday night?
Mostly cloudy skies are expected over most regions overnight due to extensive low-level moisture flowing southeastward from Lake Huron and Georgian Bay (illustrated below for mid-evening), although partly clear skies may develop occasionally. Partly clear skies are likely before morning over most regions as the northwesterly flow backs to southwesterly, but increasing mid-level cloud is forecast to move eastward over southern Ontario.

Will skies be clear over southern Ontario Wednesday night?

Lots of high cloud is expected, especially during early evening, but clear periods are likely to occasionally result in skies becoming mostly clear.

Will skies be clear over southern Ontario Tuesday night?

Cloudy skies are expected, due to widespread high cloudiness caused by jetstream-level moisture which is forecast to be over southern Ontario overnight (illustrated below for early evening), but the high cloud may occasionally be thin enough to allow the bright gibbous moon to be easily visible and cause the impression of clear skies.

Will skies be clear over southern Ontario Monday night?
Mostly cloudy skies are likely over most regions due to lake-effect cloudines caused by cold air flowing across the lakes, except for a region of less cloudiness downwind of Bruce Peninsula to western Lake Ontario (illustrated below for mid-evening) and except for far southwestern Ontario, where less cloudiness is expected. Gradually clearing skies are likely before morning.

Will skies be clear over southern Ontario Sunday night?
Partly clearing skies are likely later in the evening, after jetstream-level cloud moves eastward (illustrated below for mid-evening), except for lots of low clouds near GTA and Lake Ontario due to low-level moisture (illustrated below for early and mid-evening). Then, before morning, increasing cloudiness is likely due to more low-level moisture which is forecast to move over most regions of southern Ontario before morning.

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are expected, due to widespread low-level moisture, but some clear breaks are possible.

Will skies be clear over southern Ontario Tuesday night?

Lots of cloudiness is likely during the early evening, due to low-level moisture which is forecast to remain over most regions of southern Ontario after sunset (illustrated below for early evening) and then clearing skies are expected later in the evening, except for continuing lake-effect cloudiness over regions south and east of Lake Huron and Georgian Bay (illustrated below for mid-evening, about 10 pm EST).

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are likely over most regions, due to low-level moisture spreading southward over southern Ontario overnight (illustrated below for early evening), except for southwestern regions where skies are likely to remain clear during the evening and then become cloudy after midnight.

Will skies be clear over southern Ontario Saturday night?
Partly or mostly clear skies are expected, except for cloudy periods over regions south and east of Lake Huron and Georgian Bay, due to lots of low-level moisture (illustrated below for early and mid-evening) especially during the evening, and then mostly clear skies are likely after midnight.

Will skies be clear over southern Ontario Wednesday night?

Skies might be partly clear during the evening over some regions, but cloudy skies are likely over many regions due to lots of low-level moisture which is forecast to move over southern Ontario overnight (illustrated above for mid-evening).

Will skies be clear over southern Ontario Tuesday night?
Partly clear skies are expected over most regions, with lots of cloudy periods, caused by low-level moisture flowing south and east of Lake Huron and Georgian Bay (illustrated below for mid-evening).

Will skies be clear over southern Ontario Monday night?

Mostly clear skies are expected, except for some cloudiness during early evening over regions near and west of GTA and north of Lake Erie, due to mid-level moisture moving southward from southern Ontario during the afternoon (illustrated below for early evening) and except for regions south of Lake Huron and Georgian Bay, where low-level moisture from the lakes is likely to cause extensive lake-effect cloudiness (illustrated below for 10 pm EST).