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Canada temperatures in September

September in Canada has maximum daytime temperatures ranging from very low in Alert with -5°C to high temperatures in Osoyoos with 24°C. Nighttime temperatures generally drop to 9°C in Osoyoos and -11°C in Alert. September falls during the summer season.

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

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

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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 Canada?
  • Based on our systematic data collection, Osoyoos has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 24°C, while at night is goes down to an approximate temperature of 9°C."

  • What is the coldest city in September in Canada?
  • When looking through our records, we find that Alert stands out as the coolest city in Canada for the month of September. Daytime highs average -5°C and it cools down to about -11°C at night.

  • How much sun does Canada 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.

  • What is the water's temperature in September?
  • The water temperature averages approximately 20°C in Montréal this month, so still a bit cool to swim but some enjoy a chilly dive.

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