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 perfect, 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.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

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 17°C (63°F)  

Max Temperature 33°C (91°F)  

Chance of Rain 3%  

Precipitation 4.2 mm (0.2 in)  

Rainy days a single day  

Sunshine 290 hours *  

Percentage Sunshine *  

* Data from: Corona, the United States of America (22 KM, 13 Miles).

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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Ontario in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

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.

More climate data for Ontario

Temperature Rainfall Sunshine

See the full Ontario climate overview or explore weather in the United States of America.