Will skies be clear over southern Ontario Sunday evening?

It looks like the best answer is partly clear, due to low-level moisture causing low clouds that may occasionally cause partly or mostly cloudy skies, and occasionally clear skies, during the evening. Another layer of extensive moisture higher in the atmosphere is also causing mid-to-high level cloudiness and this will also occasionally cause some cloudiness to appear, increasing the chances of skies being partly cloudy over some regions.

The charts below show the forecast locations for more extensive moisture during the evening.