Kalispell Weather in September

What's the weather like in Kalispell (Montana) in September 2025?

The climate in Kalispell during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Kalispell and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (68°F), whilst at night 4°C (39°F) is normal.

Kalispell weather averages (imperial / metric)
Daytime temperature 19.8°C 67.6°F
Nightly temperature 3.8°C 38.8°F
Average temperature 11.8°C 53.2°F
Daily sunshine 8.3 hrs
Avg rainfall 36 mm 1.4 ins
Rainy days 8 days
Sea temperature 12.6°C 54.7°F
Humidity 64%
Windspeed 11.9kph 7 mph

On average September is the 6th driest month of the year in Kalispell with around 36mm 1.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.3 hours of sunshine per day.

September temperatures in Kalispell

Kalispell average temperature in September

September rainfall

Kalispell average rain in September

September hourly sunshine

Kalispell average rain in September

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 Kalispell in September 2025.

Other monthly averages

Best places to visit in September

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Beta

Current (hourly) weather 15 day forecast

Kalispell weather stats

Kalispell weather statistics
Hottest month: July 26.3°C 79.3°F
Driest month: March 26mm 1ins
Sunniest month: July 13.1hrs
Coldest month: January -2.1°C 28.2°F
Wettest month: June 61mm 2.4ins
Map showing location of Kalispell (48.19579, -114.31291) Kalispell map pin © Google

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