Will skies be clear over southern Ontario Monday night?

Mostly cloudy skies are likely, except for eastern regions generally near and north of western Lake Ontario, including GTHA, where skies are more likely to be partly clear during the evening. Thicker mid-level moisture is forecast to move eastward over southern Ontario overnight (illustrated below for late evening and for before sunrise) and is likely to cause mostly cloudy skies over eastern regions of southern Ontario after midnight.