Calgary Weather in September
In Calgary, September brings pleasant daytime temperatures around 19°C (66°F), with nights cooling to 4°C (39°F). Some rainfall is to be expected.
Rainfall in Calgary in September
Typically, you can expect about 8 days of rain this month, with 49 mm (1.9 in) on average. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Calgary in September
Temperatures in Calgary in September top out at 19°C (66°F) and drop to 4°C (39°F) overnight. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows around 4°C (39°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Calgary in September
There are approximately 209 hours of sunshine this month, resulting in mostly clear days.If you prefer dry days with pleasant temperatures, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Calgary's climate page.
Calgary Temperature in September
Min Temperature
4°C (39°F)
Max Temperature
19°C (66°F)
Chance of Rain
28%
Precipitation
49 mm (1.9 in)
Rainy days
8 days
Humidity
44%
Sunshine
209 hours
Percentage Sunshine
55%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Calgary typically drop from around 20°C (68°F) at the start of September to approximately 16°C (61°F) by the end. Nights are cold, with lows typically ranging from 3°C (37°F) to 8°C (46°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Calgary in September
Browse day-by-day weather records for Calgary spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Calgary historical weather extremes in September
The extremes listed below come from historical weather data collected in Calgary from 1976 through 2025.
- On September 23, 2009, temperatures climbed to 33°C (91°F), marking the warmest September day on record.
- The coldest night in September in Calgary was on September 28, 1985, with a minimum of -8°C (18°F).
Best Places in Canada in September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Calgary in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Calgary in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Calgary's climate page.
Temperature Rainfall Sunshine Humidity
See the full Calgary climate overview or explore weather in Canada.
