Ontario Weather in September
September is one of the perfect months to visit Ontario, with daytime temperatures of 28°C (82°F) and lows of 9°C (48°F) at night. Rainfall is minimal, averaging just 12 mm (0.5 in) for the month.
Rainfall in Ontario in September
Historically, September sees about 4 days of rain, with a monthly average of 12 mm (0.5 in). The odd shower may pass through, but it usually doesn't amount to much. A largely dry month overall.
Temperature in Ontario in September
The temperature in Ontario in September is perfect. Daytime highs reach 28°C (82°F), with nights dropping to 9°C (48°F). Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to 9°C (48°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Ontario.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Ontario's climate page.
Ontario Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
28°C (82°F)
Chance of Rain
13%
Precipitation
12 mm (0.5 in)
Rainy days
4 days
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Ontario in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. With minimal rainfall expected, you can leave the rain gear at home.What To Do in Ontario in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Ontario's climate page.
See the full Ontario climate overview or explore weather in the United States of America.
