Jasper Weather in September

The climate in Jasper during September can be summarized as hot, humid and damp.

September is in the fall / autumn in Jasper and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 19°C (67°F) is normal.

On average September is the 5th wettest month of the year in Jasper with around 114mm 4.5 inches of rain making it a damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.4 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Jasper in September 2025.