Will skies be clear over southern Ontario Sunday night?
Mostly clear skies are likely, except for some mid and high-level clouds likely to appear occasionally over most regions, caused by some high and mid-level moisture which is forecast to be over southern Ontario (illustrated below for mid-evening). Also, more extensive low-level cloudiness is likely over regions south and east of Lake Huron and Georgian Bay.

Will skies be clear over southern Ontario Wednesday night? Mostly clear skies are likely except for some cloudiness due to low-level moisture over regions south and east of Lake Huron and Georgian Bay (illustrated below for early evening).

Will skies be clear over southern Ontario Tuesday night?
Mostly clear skies are likely, except for occasional periods of partly or mostly cloudy sky with low clouds, especially over regions east of Lake Huron.

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are likely, except for occasional periods of partly or mostly cloudy sky with low clouds, especially over regions east of Lake Huron.

Will skies be clear over southern Ontario Saturday night?
Mostly cloudy skies are expected due to extensive low-level moisture which is forecast to be over southern Ontario overnight (illustrated below for early evening). Partly cleraring skies may appear around sunset and early evening over some regions, but mostly cloudy skies seem likely over most regions.

Will skies be clear over southern Ontario Wednesday night?

Partly or mostly clear skies are expected over some regions during the evening, except for more mid-level cloudiness over southwestern regions and some low-level cloudiness that may persist during early evening over regions south and east of Lake Huron and Georgian Bay. Later in the evening and overnight, increasing mid-level cloudiness is expected due to mid-level moisture which is forecast to move eastward over southern Ontario overnight (illustrated below for mid-evening).

Will skies be clear over southern Ontario Tuesday night?

Mostly clear skies are expected during the first several hours after sunset, and then partly cloudy skies are expected over some regions, due to low-level moisture which is forecast to move southward over southern Ontario during the evening (illustrated below for mid-evening).