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.