Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are likely, except for partly or mostly clear skies over southern parts, near Lakes Ontario and Erie, during the first several hours after sunset, before more substantial mid-level moisture moves over southern Ontario (illustrated below for early evening) and causes partly to mostly cloudy skies over most regions. Over northern regions of southern Ontario (closer to Lake Huron and Georgian Bay), skies are more likely to be mostly cloudy.

Will skies be clear over southern Ontario Monday night?
Clear skies are expected, except for cloudiness during early evening over regions near GTA until moisture and cloudiness moves eastward from southern Ontario by mid-evening. Some high clouds may also be visible due to the jetstream moving eastward across southern Ontario overnight.

Will skies be clear over southern Ontario Wednesday night?
Lots of mid and high-level moisture (illustrated below for early evening) will be present to cause some visible cloud, especially during the evening, and then less cloud after approximately midnight may cause the sky to appear mostly clear.

Will skies be clear over southern Ontario Tuesday night?
Clear or mostly clear skies are expected during most of the night, except for some high clouds that may appear over some regions, caused by a region of mid-level moisture forecast to move over southern Ontario overnight (illustrated below for late evening), and then some high clouds are likely to appear before sunrise.

Will skies be clear over southern Ontario Monday night?
Skies are expected to be mostly clear during the evening (except for high cloud that may be visible) and then partly cloudy skies are expected by about midnight as mid-level moisture moves over southern Ontario (illustrated below for late evening) ahead of a weak cold front.

Will skies be clear over southern Ontario Saturday night?
Clearing skies are expected as mid-level moisture moves eastward from southern Ontario during the evening (illustrated below for late evening) and then low-level clouds, including fog, are likely to form after midnight over some regions.

Will skies be clear over southern Ontario Friday night?
Cloudy skies are expected, except for partly clear skies during the evening over most regions before widespread cloud moves over southern Ontario by or shortly after midnight. Lots of high clouds will likely be visible during the evening, due to lots of jetstream-level moisture which is forecast to move over southern Ontario by evening (illustrated below for early evening).

Will skies be clear over southern Ontario Thursday night?
Skies are likely to be clear or mostly clear, except for some high clouds that may appear in the bright moonlight occasionally over some regions, caused by regions of jetstream-level moisture which are forecast to move over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Wednesday night?
Clear skies are expected, as a large high pressure ridge spreads over Ontario during Wednesday and overnight.

Will skies be clear Tuesday night over southern Ontario?
Cloudy skies are expected due to lots of mid and high-level moisture moving over southern Ontario, except that skies may appear partly cloudy during the evening in locations where breaks in the high cloudiness allow the moon and brighter stars to be visible and give the impression of partly clear skies.

Will skies be clear over southern Ontario Monday night?

Mostly clear skies are expected, except for some high cirrus cloud that may be visible in the bright moonlight during the evening due to jetstream-level moisture which is forecast to move over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Sunday night?
Clear skies are expected, after some possible periods of low-level cloudiness that may persist for several hours after sunset over some regions.

Will skies be clear over southern Ontario Saturday night?
After midnight, clearing skies are likely as moisture moves eastward from southern Ontario (illustrated below for early Sunday morning). Some regions southeast of Lake Huron and Georgian Bay may remain cloudy, and some high cirrus cloud may be visible due to the jetstream moving over southern Ontario after midnight.

Will skies be clear over southern Ontario Thursday night?

Clearing skies are expected during the evening as mid and high-level moisture moves eastward during the evening (illustrated below for late evening). Skies may be mostly cloudy at sunset (especially in regions close to Lakes Erie and Ontario) and then clear by midnight.

Will skies be clear Wednesday night over southern Ontario?
Mostly cloudy skies are likely, except that lots of breaks in the low and mid-level moisture may allow skies to occasionally be clear enough over some or most regions for the moon and bright stars to be visible, even through the high cloud and low-level humidity.

Will skies be clear over southern Ontario Tuesday night?

Lots of moisture will be available to cause clouds at all levels, and high humidity will cause skies to appear hazy, but mid-evening skies will probably appear starry (except for widespread high-level clouds) due to a region of less mid-level moisture  which is forecast to move over most regions of southern Ontario overnight (illustrated below for late evening).

More clear skies Monday night!
(Except for some thin cirrus overnight, followed by increasing high cloudiness before morning.)

Continuing clear skies (other than very thin cirrus) - no need for an update!

Will skies be clear over southern Ontario Friday night?

Clear skies are expected.

Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are expected, except for some low-level clouds during early evening that are likely to diminish overnight as low-level moisture (illustrated below for early evening) moves southward from southern Ontario during the evening.