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Temperatures in September
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Temperature in Ontario in September

Ontario is a region in Canada. September in has maximum daytime temperatures ranging from moderate in Niagara on the Lake with 17°C to high temperatures in Chatham with 24°C. Nighttime temperatures generally drop to 14°C in Chatham and 9°C in Niagara on the Lake. September is a summer month.

What is the temperature of the different cities in Ontario in September?

Explore the map below to discover average September temperatures at the top destinations in Ontario. For a deeper dive, simply click on any destination dot.

Weather conditions Weather
Temperatures
Precipitation
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Legend very warm warm pleasant moderate cold very cold
Very warm means maximum temperatures above 30°C. Warm: 22°C to 30°C. Pleasant: 18°C to 22°C Moderate: 12°C to 18°C. Cold: 2°C to 12°C. Very cold: lower than 2°C

  • What is the warmest city in September in Ontario?
    • Chatham tops the warmest city list in our database with average maximum daytime temperatures around 24°C and a minimum nighttime temperature of around 14°C.

  • What is the coldest city in September in Ontario?
    • When looking through our records, we find that Niagara on the Lake stands out as the coolest city in Ontario for the month of September. Daytime highs average 17°C and it cools down to about 9°C at night.

  • How much sun does Ontario get in September?
    • Toronto enjoys close to 195 hours of sunlight. This not only brightens the days but also uplifts the atmosphere during the month.

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