Will skies be clear over southern Ontario Sunday night?
Clear skies are expected, except for some high cloud that may appear over some or most regions occasionally, caused by jetstream-level moisture which is forecast to move across southern Ontario overnight (illustrated below for early Monday).

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are expected overnight, due to lots of moisture and cloudiness, except that clear breaks may occasionally move over some regions and cause skies to become partly clear.

Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are expected during the evening, followed by some cloudiness after midnight, due to some regions of mid and upper-level moisture which are forecast to move over some regions of southern Ontario overnight.

Will skies be clear over southern Ontario Wednesday night?

Mostly clear skies are expected, except for some upper-level cloudiness that may appear over some regions, especially after midnight, caused by some increasing high-level moisture which is forecast to move across southern Ontario overnight.

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are expected, due to increasing high cloudiness over most regions and due to increasingly thick mid-level cloudiness over southwestern regions, but skies may occasionally be clear enough over some regions for the bright planets and brighter stars to be clearly visible.

Will skies be clear over southern Ontario Saturday night?
Mostly clear skies are expected, except for some high wispy clouds that could appear occasionally over some regions, caused by regions of jetstream-level moisture which are forecast to move southeastward over southern Ontario overnight.

Will skies be clear over southern Ontario Friday night?
Clear skies are expected, except for some high cloud that may be visible over southwestern regions, caused by high-level moisture (illustrated below for late evening) and cloud spreading northeastward ahead of a large thunderstorm complex southwest of the Great Lakes during Friday afternoon.

Will skies be clear over southern Ontario Thursday night?
Cloudy skies are expected during the evening, followed by gradually clearing skies before morning, as cloudiness moves southeastward from southern Ontario overnight.

Will skies be clear over southern Ontario Tuesday night?
Partly clear skies are expected, except for varying amounts of clouds expected overnight due to some moisture at low and mid levels of the atmosphere, followed by increasing high-level cloudiness before morning.

Will skies be clear over southern Ontario Monday night?

Mostly cloudy skies are expected, due to lots of high and mid-level moisture which is forecast to be over southern Ontario overnight (illustrated above for late evening), but lots of breaks in the clouds will likely allow the full moon to be easily visible some of the time over most regions and give the appearance of mostly clear skies.

Will skies be clear over southern Ontario Tuesday night?

Clear skies are expected, except for some high clouds that may be visible after midnight, due to a region of high-level moisture which is forecast to move eastward over southern Ontario later in the night and which might cause visible clouds.

Will skies be clear over southern Ontario Monday night?

Cloudiness during the evening is forecast to move eastward, followed by clearing skies overnight except for some low clouds that may appear over some locations, caused by low-level moisture which is forecast to remain over some regions (especially south of Georgian Bay) after midnight (illustrated below for early Tuesday).

Will skies be clear over southern Ontario Saturday night?
Mostly cloudy skies are expected over southwestern regions, due to increasing high cloudiness, caused by increasing jetstream-level moisture moving northeastward over southern Ontario during Saturday (illustrated below for late evening), while less high cloud over regions near, north and east of the GTA may leave skies appearing partly or mostly clear.

Will skies be clear over southern Ontario Friday night?

Clear skies are expected, along with dry air (due to winds from the northeast around a high pressure ridge over northern Ontario).

Will skies be clear over southern Ontario Thursday night?
Clear skies are expected, except for some clouds that may persist after sunset during the early evening in some regions, caused by a region of low-level moisture which is forecast to remain over some regions during the evening (illustrated below for late evening).

Will skies be clear over southern Ontario Monday night?
Clear skies are expected until early morning, and then increasing cloudiness is expected beginning in southwestern regions.

Will skies be clear over southern Ontario Sunday night?
Clear skies are expected, due to a high pressure ridge building southward over the Great Lakes region.