Calgary Weather in September
Canada · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Calgary sees average temperatures ranging from a low of 7.3°C (45.1°F) to a high of 19.8°C (67.6°F), with a mean of 13.3°C (55.9°F). Compared to the annual average of 4.6°C (40.3°F), this month is 8.7°C warmer than the yearly norm. Precipitation averages 29.0mm, making it approximately 12.0mm drier than the monthly average of 41.0mm. The city receives an average of 10.3 hours of sunshine per day during September, with relative humidity averaging 60.0%. Wind speeds reach an average maximum of 17.4 km/h. For travelers, this month offers a temperature experience in Calgary, with drier-than-average conditions compared to the rest of the year.
Calgary's high altitude and continental position create a climate with wide temperature ranges. I've studied the Chinook winds that provide dramatic winter warming, sometimes raising temperatures by 20°C in hours. The best time for visiting is June to August, when the weather is warmest and the nearby Rocky Mountains are accessible for hiking.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 17.2°C (63.0°F) | 13.3°C (55.9°F) | 5.3°C (41.5°F) |
| Rainfall | 52.9mm | 29.0mm | 33.7mm |
| Sunshine | 12.0 hrs | 10.3 hrs | 7.5 hrs |
| Humidity | 63.0% | 60.0% | 64.5% |
| Wind | 17.4 km/h | 17.4 km/h | 17.5 km/h |
| Rainy Days | 12.2 | 9.0 | 8.0 |
| Snowfall | 0.0 cm | 0.0 cm | 11.0 cm |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Calgary in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Calgary in September?
The average temperature in Calgary during September ranges from 7.3°C (45.1°F) to 19.8°C (67.6°F), with a mean of 13.3°C (55.9°F).
How much does it rain in Calgary in September?
Calgary receives an average of 29.0mm of precipitation in September, spread across approximately 9.0 rainy days.
What should I pack for Calgary in September?
Based on September weather data, pack warm layers, a medium jacket, and waterproof outerwear.
Is September a good time to visit Calgary?
September is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Calgary
Cities with Similar September Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 51.05°, -114.07°. Timezone: America/Edmonton. Last updated: 2026-07-30.