Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected during the evening, and then high cloudiness may appear over many regions after about midnight, as well as low cloud and mist that may develop over some regions before morning.

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are likely, due mainly to a high cloud deck, but partly clear skies could develop occasionally over some regions where thinner gaps in the high-level moisture allow stars to become visible and give the impression of partly clear sky.

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are likely over most regions, due to extensive low-level moisture and cloud, except for partly clear skies that may develop over some regions occasionally.

Will skies be clear over southern Ontario Wednesday night?
Mostly clear skies are likely over many regions, except that periods of cloudiness are likely over regions south and east of Lake Huron and Georgian Bay, caused by extensive low-level moisture flowing southeastward from the lakes (illustrated below for late evening).

Will skies be clear over southern Ontario Tuesday night?

Mostly clear skies are likely during some of the evening over some regions near Lake Erie and western Lake Ontario where atmospheric moisture diminishes (illustrated below for mid-level moisture). Otherwise, lots of low and mid-level moisture is likely to cause mostly cloudy skies.

Will skies be clear over southern Ontario Monday night?
Mostly cloudy skies are likely, due to lots of mid and high-level moisture, except for partly clear skies occasionally over some regions where the high cloud diminishes enough for stars to be visible.

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are expected, except for partly or mostly clear skies that may develop occasionally over some regions where the low cloud diminishes and allows stars and the bright gibbous moon (after moonrise) to appear.