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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.

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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 TemperatureMin Temperature 17°C (63°F)  
Max TemperatureMax Temperature 33°C (91°F)  
Chance of RainChance of Rain 3%  
PrecipitationPrecipitation 4.2 mm (0.2 in)  
Rainy daysRainy days a single day  
SunshineSunshine 290 hours *  
Percentage SunshinePercentage Sunshine *  
* Data from: Corona, the United States of America (22 KM, 13 Miles).

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 →

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

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.

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