Thursday, October 2, 2025

How did Calgary's September temperatures compare to the long-term average?

Calgary's September 2025 temperatures were far above the long-term average, making it the warmest September ever recorded for the city. The mean temperature in Calgary for the month was 16.41°C, surpassing the previous record of 15.96°C set in 1938. For context, Calgary’s typical mean temperature for September is around 12°C, and daytime highs usually hover near 16°C. This year, daytime highs often exceeded 20°C, and the city experienced more days with temperatures above the seasonal norm.theweathernetwork+4

This unprecedented warmth, combined with record-low precipitation, established September 2025 as an extreme outlier compared to historical climate norms in Calgary.cbc+1

  1. https://www.theweathernetwork.com/en/news/weather/forecasts/summery-september-breaks-records-in-alberta
  2. https://www.cbc.ca/news/canada/calgary/warm-autumn-weather-calgary-1.7639353
  3. https://www.thomascook.com/holidays/weather/canada/calgary/september/
  4. https://www.theweathernetwork.com/en/news/weather/forecasts/calgary-faces-driest-september-in-more-than-100-years-alberta
  5. https://www.holiday-weather.com/calgary/averages/september/
  6. https://weatherspark.com/h/m/2349/2025/9/Historical-Weather-in-September-2025-in-Calgary-Alberta-Canada
  7. https://en.climate-data.org/north-america/canada/alberta/calgary-390/t/september-9/
  8. https://calgary.weatherstats.ca/charts/temperature-monthly.html
  9. https://weatherspark.com/h/m/145468/2025/9/Historical-Weather-in-September-2025-at-Calgary-International-Alta.;-Alberta;-Canada
  10. https://calgary.citynews.ca/2025/09/22/calgary-first-day-of-fall/
  11. https://avionero.com/New-York-Calgary.NYC-YYC/weather/september
  12. https://calgary.weatherstats.ca/metrics/temperature.html
  13. https://www.accuweather.com/en/ca/calgary/t2p/september-weather/52479
  14. https://www.worldweatheronline.com/calgary-weather-averages-september/alberta/ca.aspx
  15. https://climate.weather.gc.ca/climate_data/almanac_e.html?StationID=50430
  16. https://calgary.weatherstats.ca/charts/extreme_min_max_temperature-daily.html
  17. https://weatherspark.com/m/2349/9/Average-Weather-in-September-in-Calgary-Alberta-Canada
  18. https://www.weather-atlas.com/en/canada/calgary-weather-september
  19. https://ca.news.yahoo.com/calgary-track-see-driest-september-220606255.html
  20. https://www.predictwind.com/fr/weather/canada/alberta/calgary/september

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