Will skies be clear over southern Ontario Thursday night?
Mostly clear skies are expected during the evening, except for some high this clouds that may be present, and then increasing cloudiness is expected after midnight due to high-level moisture which is forecast to move over southern Ontario ahead of Friday's cold front.

Will skies be clear over southern Ontario Wednesday night?
Clear skies are forecast, except for some jetstream-level clouds that might be visible over southwestern regions before morning.

Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are likely during the evening, followed by clearing skies over southwestern regions after midnight as mid-level moisture (illustrated below for early Wednesday, EDT 02:00) gradually moves southward from Ontario.

Will skies be clear over southern Ontario Monday night?
Partly or mostly cloudy skies are likely over southern Ontario overnight, due to moisture and lift with Monday evening's cold front. Moisture appears to not be thick enough for widespread cloudiness, and so occasional patches of partly or mostly clear skies could appear over various regions from time to time.

Will skies be clear over southern Ontario Friday night?
Clear skies are likely over all regions.

Note: no updates during Saturday.

Will skies be clear over southern Ontario Thursday night?

Skies are likely to be mostly clear, except for some high-level cloudiness which is forecast to mostly move southeastward from southern Ontario by evening. Also, more persistent mid-level moisture over southwestern Ontario (illustrated below for late evening) is likely to be visible as some mid-level cloudiness over southwestern regions during most of the night.

Will skies be clear over southern Ontario Wednesday night?

Lots of cloudiness will be over southwestern regions to the north of a storm system which is forecast to move eastward across the southern Great Lakes region overnight and to be near northern Ohio early Thursday. Some mid and high-level moisture will extend further northward over most regions of southern Ontario (illustrated below for late evening), and some regions may experience mostly clear skies especially during the evening, followed by a greater chance of high clouds after midnight.

Will skies be clear over southern Ontario Tuesday night?
Lots of mid-level clouds will probably be visible during the evening over most regions, except over far southwestern regions, where mostly clear skies are likely, and then more extensive cloudiness is likely to spread over most regions by late evening or midnight ahead of an upper-level disturbance which is forecast to move southeastward across southern Ontario overnight. Regions that have partly or mostly clear skies during the evening will have jetstream-level moisture overhead which may cause some high, thin jetstream-level clouds to be visible.

Will skies be clear over southern Ontario Monday night?

Clear skies are expected, except for some mid-level clouds diminishing during the evening as mid-level moisture (illustrated below for late evening) moves southward from Ontario following this afternoon's cold front.

Will skies be clear over southern Ontario Sunday night?

It looks like mostly clear skies, except for lots of high jetstream-level clouds increasing overnight as jetstream-level moisture moves eastward (illustrated below for Sunday night) ahead of Monday night's cold front.

Will skies be clear over southern Ontario Saturday night?

Skies are likely to appear mostly clear, except for jetstream-level thin cloud that is forecast to be over most regions during most of the night (illustrated below for late evening) and will probably cause high, thin cloud to be visible in the otherwise clear sky.

Will skies be clear over southern Ontario Friday night?

It looks like skies will be clear as a high pressure ridge spreads southward over southern Ontario, along with a dry (low humidity) northeasterly airflow (and so skies should be bright with unobstructed moonlight).

Will skies be clear over southern Ontario Thursday night?

It looks like skies will be clear near, north and east of the GTHA but partly or mostly cloudy over southwestern regions during the evening, until mid-level moisture (illustrated below for late evening) moves southward from the province after midnight. Then, during the pre-dawn period, some jetstream-level moisture is forecast to move southward over southern Ontario and may cause some high clouds to be visible.

Will skies be clear over southern Ontario Tuesday night?
Mostly cloudy skies are expected, except for regions near western Lake Ontario including the GTHA during the evening, where increasing mid-level cloudiness is not forecast until late evening or midnight. Jetstream-level winds will also be over southern Ontario and so high-level thin clouds may be visible at sunset and during the evening before the mid-level moisture (illustrated below for late evening) causes increasing cloudiness.

Will skies be clear over southern Ontario Monday night?

Partly clear skies are expected over most regions, except for cloudy skies over southwestern regions. Regions of moisture at low and mid-levels are likely to cause some clouds to be visible from time to time over most regions. In addition, jetstream winds over southern Ontario will likely cause some amount of high cirrus cloud to be visible over regions where there are no lower and mid-level clouds.

Will skies be clear over southern Ontario Sunday night?
Clear skies are likely during the evening over most regions, except for some mid-level clouds over eastern regions of southern Ontario (approximately north, south and east of GTHA) until mid-level moisture (illustrated below for late evening) moves south of the province. After midnight, mostly clear skies are expected except for high thin clouds that may appear when jetstream-level moisture moves eastward over southern Ontario (illustrated below for early morning).

Will skies be clear over southern Ontario overnight?
Mostly clear skies are likely, except for some patches of mid and high-level cloud that may appear over some regions. Jetstream winds over southern Ontario during the evening, and a cold front passage, may or may not cause some visible clouds.

Will skies be clear over southern Ontario Friday night?
Mostly cloudy skies are likely except for the GTHA and areas near, west and north of western lake Ontario, where only jetstream-level thin cloud is expected and thicker mid-level moisture (illustrated below for late evening) is not likely to move eastward over these regions until about midnight. With the jetstream over southern Ontario, some high, thin cloud is likely to be visible at sunset and may be visible during the early and mid-evening in the regions not under the thicker mid-level moisture.

Will skies be clear over southern Ontario Thursday night?
Substantial cloudiness is likely over most of southern Ontario during the evening over many regions west of Lake Ontario, caused by a region of mid-level moisture (illustrated below for late evening) which is forecast to move south from southern Ontario overnight. It looks like clear skies are likely over the GTHA and many of the populated regions near and north and east of western Lake Ontario.

Will skies be clear over southern Ontario Wednesday night?
Mostly clear skies are likely, following some early-evening low-level cloudiness that is likely to dissipate soon after sunset, except for some high jetstream-level thin cirrus clouds that may become visible over parts of southern Ontario as a result of moisture (illustrated below for late evening) along the jetstream which is directly over southern Ontario.

Will skies be clear over southern Ontario Tuesday night?

Partly clear skies are likely over most regions sometime overnight. During the evening, skies are more likely to be partly or mostly cloudy over most southwestern regions, caused by a significant region of mid-level moisture which is forecast to move eastward over southwestern Ontario during the evening (illustrated below for late evening).

Will skies be clear over southern Ontario Monday night?
Partly clear skies are likely after about mid-evening, following some early evening cloudiness following a late-afternoon cold front. Overnight, some mid-level moisture (illustrated below for late evening) is likely to cause some cloudy periods over most regions along with some clear periods.

Will skies be clear Saturday night over southern Ontario?

Cloudy skies are likely by sunset and cloudy overnight.

Will skies be clear over southern Ontario Friday night?
Skies are likely to be mostly clear during the evening over most regions, except for some low-level clouds that will be over regions near western Lake Ontario, caused by a region of low-level moisture (illustrated below for late evening). Then, after midnight, increasing high cloudiness is likely to appear over most regions as increasing jetstream-level moisture moves eastward over southern Ontario (illustrated below for 2 am EDT Saturday).

Will skies be clear over southern Ontario Thursday night?

High thin cloudiness is likely to be over most of southern Ontario during most of the night near and approximately south of a line from southern Lake Huron to  the GTHA, caused by jetstream-level moisture close to the jetstream which is over Ontario (illustrated below for Thursday late evening). The moisture and cloud may be thin enough to give the impression of clear and starry skies (especially from urban locations where only the planets and brightest stars can normally be seen).