Ontario Weather in September

Ontario in September averages 33°C (91°F) during the day and 17°C (63°F) at night. Minimal rainfall is typical for this time of year.

Rainfall in Ontario in September

Expect around a single day of rain based on historical data, with 4.2 mm (0.2 in) average. On the rare occasion it rains, expect a brief, moderate shower rather than a heavy downpour.

Temperature in Ontario in September

September in Ontario is generally excellent, with days reaching 33°C (91°F) and nights settling around 17°C (63°F). For most visitors, the main thing to prepare for is the heat during the day. With lows of 17°C (63°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Ontario in September

Expect sunny days throughout the month, with an estimated 290 hours of sunshine. This makes it a pleasant time to visit Ontario.

If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April, May, October and November typically offer the best circumstances for Ontario.