Will skies be clear Monday night over southern Ontario?
It looks like skies will remain mostly clear for several hours after sunset over most regions near and east of Lakes Erie and Ontario, but cloudiness is expected to move southeastward across southern Ontario later in the evening.

Will skies be clear Sunday night over southern Ontario?
It looks like skies will be mostly cloudy, due to widespread high clouds and some regions with thicker middle-high clouds.

Will skies be clear over southern Ontario Saturday night?
It looks like skies will be mostly clear except for high cloud at jetstream level which is forecast to move northeastward over southern Ontario during the evening. So, the moisture may be visible as cirrus or cirrostratus cloud earlier in southwestern Ontario and later in the evening toward the Toronto region.

Will skies be clear Friday night?
Clear skies continue, no need for any details or supporting information!

Will skies be clear Thursday night over southern Ontario?

Continuing clear skies are continuing as a result of a high pressure region over southern Ontario.

The only detail that may be worthwhile to point out is the presence of some jetstream-level moisture forecast to be over southern Ontario Thursday evening, that may appear as some cirrus clouds in the sky over regions mainly west of Toronto.

Will skies be clear over southern Ontario Tuesday night?

Skies are likely to be mostly clear as a result of a large high pressure ridge over the province.

Will skies be clear over southern Ontario Monday night?

Skies are likely to become mostly clear before sunset and be mostly clear overnight. Some mid-level moisture may occasionally appear as visible clouds, and jetstream-level cirrus clouds might also appear over some locations.