September weather forecast
Canada

September in Canada is a time of transition as the warm summer gives way to the cooler, crisp conditions of autumn. The month usually starts with mild temperatures, but these gradually decrease as the month progresses.

In the northern territories of Nunavut and Yukon, the temperatures in September usually fluctuate between 5°C (41°F) and 15°C (59°F). The daylight hours reduce significantly compared to the summer months, signaling the onset of the long Arctic winter.

On the west coast, in cities such as Vancouver and Victoria, September offers a pleasant mix of summer and autumn conditions. The temperatures typically range from 10°C (50°F) to 20°C (68°F), with an increase in rainfall towards the end of the month.

In the Prairie provinces, including Calgary and Winnipeg, temperatures can vary widely. The beginning of September may see daytime highs of 20°C (68°F) to 25°C (77°F), but by the end of the month, these can drop to between 10°C (50°F) and 15°C (59°F). The region often experiences an increase in rainfall, and the first frost often occurs during this month.

Atlantic Canada, encompassing cities such as Halifax and St. John's, sees temperatures ranging from 10°C (50°F) to 20°C (68°F). The weather in this region can be highly variable in September, with a mix of sunny and rainy days. The cool Atlantic breeze adds to the onset of the autumn chill.

Snowfall in September is rare, except in the northern territories and the highest parts of the Rocky Mountains, where the first snowfall of the season may occur. Across the country, the foliage begins to change to vibrant hues of orange, red, and yellow, making September a beautiful time for nature walks and scenic drives.

In comparison to August, September tends to be cooler and wetter, particularly in the latter half of the month. The days become noticeably shorter, and the temperatures at night drop significantly. Despite the cooling weather, Canadians continue to engage in outdoor activities, taking advantage of the vibrant autumnal landscapes before winter sets in.

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• Toronto - September »
  August and September, with an average relative humidity of 74%, are the least humid months in Toronto, Canada. August and September, with an average relative humidity of 74%, are the least humid months in Toronto.
• Montreal - September »
  In Montreal, during September, the rain falls for 12 days and regularly aggregates up to 55mm (2.17") of precipitation. On the last day of September, in Montreal, sunrise is at 6:52 am and sunset at 6:35 pm EDT.
• Vancouver - September »
  August and September, with an average sea temperature of 11.3°C (52.3°F), are months with the warmest seawater in Vancouver, Canada. August and September, with an average sea temperature of 11.3°C (52.3°F), are months with the warmest seawater in Vancouver.
• Ottawa - September »
  As Ottawa, Canada, enters September, the average high-temperature subtly lowers from the a warm 24°C (75.2°F) of August to a pleasant 20.2°C (68.4°F). September temperatures in Ottawa vary between a high-temperature of 20.2°C (68.4°F) and a low-temperature of 10°C (50°F).
• Calgary - September »
  In Calgary during September, the rain falls for 7.8 days and regularly aggregates up to 16mm (0.63") of precipitation. With an average relative humidity of 59%, September is the least humid month in Calgary.
• Edmonton - September »
  In Edmonton during September, the rain falls for 9.5 days and regularly aggregates up to 23mm (0.91") of precipitation. In Edmonton, during September, the rain falls for 9.5 days and regularly aggregates up to 23mm (0.91") of precipitation.
• Winnipeg - September »
  In Winnipeg in September, it is raining for 10.2 days, with typically 43mm (1.69") of accumulated precipitation. In Winnipeg, snow does not fall in June through September.
• Quebec city - September »
  In Quebec city, during September, the rain falls for 15 days and regularly aggregates up to 123mm (4.84") of precipitation. On the last day of September, in Quebec city, sunrise is at 6:43 am and sunset at 6:25 pm EDT.
• Hamilton - September »
  In Hamilton in September, the average water temperature is 21.1°C (70°F). In Hamilton in September, the average water temperature is 21.1°C (70°F).
• Kitchener - September »
  The arrival of September in Kitchener signals a subtle shift in temperature, down from a moderately hot 24°C (75.2°F) in August to a pleasant 20.8°C (69.4°F). On the last day of September, in Kitchener, sunrise is at 7:19 am and sunset at 7:04 pm EDT.
• London - September »
  In London in September, during 10.6 rainfall days, 23mm (0.91") of precipitation is typically accumulated. On the first day of September in London, Canada, sunrise is at 6:50 am and sunset at 7:59 pm.
• Victoria - September »
  The months with the warmest seawater in Victoria are August and September, with an average sea temperature of 11.5°C (52.7°F). In Victoria, Canada, in September, the average water temperature is 11.5°C (52.7°F).