Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are expected, except for partly clear skies with lots of high cloud during early evening over many regions until more moisture and cloudiness moves eastward over southern Ontario later in the evening.

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are expected, except for some clouds that may appear occasionally over southwestern regions, due to a region of moisture which is forecast to be over southwestern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected, except for some high cloud caused by jetstream-level moisture which is forecast to move over southern Ontario overnight (illustrated below for late evening) and except for high humidity and extensive low-level moistute causing fog in some regions.

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are expected, due to lots of mid-level moisture (illustrated below for late evening), except for regions near and north of the GTA, where skies are likely to be mostly clear for several hours during the evening as a gap in the moisture moves eastward across the area.

Will skies be clear over southern Ontario Thursday night?
Partly or mostly cloudy skies are likely over most regions during the evening, due to lots of mid-level moisture which is forecast to move over southern Ontario during the evening (illustrated below for late evening) and then mostly clear skies are likely during early morning after the mid-level moisture moves east from southern Ontario.

Will skies be clear over southern Ontario Wednesday night?

Partly or mostly clear skies are likely over most regions, with periods of cloudiness at times, due to mid-level moisture which is forecast to be over southern Ontario overnight (illustrated below for late evening) and with enough periods of mostly clear sky to allow the full moon to be easily visible and give the impression of clear sky.

Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are likely, due to lots of mid-level moisture available (illustrated below for late evening) as well as some high cirrus cloud, but enough clear breaks may exist over many regions to occasionally result in the nearly full moon being brightly visible and giving the impression of a mostly clear sky.