Summery September breaks records in Alberta
September in Alberta featured hot summer weather. How did that affect the province's long-standing records?
Summer across Alberta this year was perfectly average—not too hot and not too cold, either. But the heat really cranked up after the start of meteorological fall in September, breaking long-standing records in Edmonton and Calgary.
A September heat wave helped the cities break more than one record each this year. In fact, September, on average, was nearly warmer than the entire summer was across the province!
September average temperature versus average temperature across June, July, and August:
Calgary: 23.7°C vs. 22.3°C
Edmonton: 24.0°C vs. 23.8°C
Medicine Hat: 23.7°C vs. 26.7°C
Banff: 21.7°C vs. 22.7°C
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Average temperature records broken in Edmonton and Calgary
Edmonton and Calgary both recorded their warmest mean temperatures (average of combined daytime and nighttime temperatures in one day) on record for the month of September this year.
The mean temperature in Calgary for September 2025 was 16.41°C, beating out the previous record of 15.96°C that was set in 1938.
Edmonton saw a mean temperature of 16.46°C, which beat their previous record of 16.02°C set in 1967.
It wasn't just these two cities that had a record-breaking September, either. Banff also recorded their warmest mean temperature at 14.09°C.
In terms of average maximum daytime temperatures, Edmonton saw an average of 24.04°C, making this the warmest September in the city's history. The previous record-holder was set in 1938 with a maximum average of 24.02°C.
Banff also saw their warmest September on record, recording an average maximum temperature of 22.88°C for the month.
While this wasn't the warmest September on record for Calgary, the city did manage to set a different record.
Calgary sees driest September in 140 years
September in Alberta wasn't only hot—it was also dry.
With only 0.4 mm of rainfall in Calgary, this has been the driest September on record since 1885.
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Similarly, Edmonton only received 0.1 mm of rainfall, making it the driest September since 1888.
Closer to the Saskatchewan border, Medicine Hat saw zero rainfall in September, tying with 1908 and 1920 for the driest September.
What's ahead?
A new month means a change in the weather, right? Luckily, for now, yes!
Forecasters are looking at a classic fall setup across Alberta over the next ten days. An upper-level trough will usher in cooler temperatures for the first week of the month.
The break from the fall heat won't last too long, though. We'll see a ridge of high pressure build back up, bringing another round of above-seasonal temperatures to the province.
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Stay with The Weather Network for more information and updates on your weather across Alberta.