Last updated: June 18, 2025
In September, the average temperature in Grande Prairie, Canada hovers around 10°C (50°F), with a minimum of -9°C (15°F) and a maximum reaching 28°C (83°F). Expect 53 mm (2.1 in) of precipitation over 9 days, accompanied by a notable average humidity of 80%. Be prepared for a mix of chilly and warm spells this month!
In September in Grande Prairie, the average temperature is 10°C (50°F), with maximums reaching up to 28°C (83°F) and minimums dropping as low as -9°C (15°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack layers to stay comfortable throughout the day.
In Grande Prairie in September, the total precipitation amount is 53 mm (2.1 in) spread over 9 days.
In Grande Prairie in September, humidity is 80%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill enveloping you, making traveling somewhat uncomfortable as it seeps into your clothes and clings to your skin, leaving you longing for a cozy indoor refuge.
In Grande Prairie in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Grande Prairie, you can refer to this Hourly UV Index in Grande Prairie.
UV Risk Categories
Weather in Grande Prairie varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grande Prairie, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -10°C (14°F) | 22 mm (0.9 inches) | 93% | low |
| February Weather | -12°C (10°F) | 29 mm (1.2 inches) | 94% | low |
| March Weather | -5°C (23°F) | 31 mm (1.2 inches) | 89% | moderate |
| April Weather | 2°C (35°F) | 32 mm (1.3 inches) | 85% | moderate |
| May Weather | 11°C (52°F) | 40 mm (1.6 inches) | 81% | high |
| June Weather | 15°C (59°F) | 71 mm (2.8 inches) | 78% | high |
| July Weather | 17°C (62°F) | 101 mm (4.0 inches) | 84% | very high |
| August Weather | 15°C (60°F) | 53 mm (2.1 inches) | 81% | high |
| September Weather | 10°C (50°F) | 53 mm (2.1 inches) | 80% | high |
| October Weather | 3°C (37°F) | 42 mm (1.6 inches) | 86% | moderate |
| November Weather | -5°C (23°F) | 57 mm (2.2 inches) | 91% | low |
| December Weather | -10°C (15°F) | 23 mm (0.9 inches) | 96% | low |