Bozeman Weather in September

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

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

September is in the fall / autumn in Bozeman and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (69°F), whilst at night 4°C (40°F) is normal.

Bozeman weather averages (imperial / metric)
Daytime temperature 20.3°C 68.5°F
Nightly temperature 4.3°C 39.7°F
Average temperature 12.3°C 54.1°F
Daily sunshine 9.5 hrs
Avg rainfall 49 mm 1.9 ins
Rainy days 7 days
Sea temperature 14.3°C 57.7°F
Humidity 52%
Windspeed 14.8kph 9 mph

On average September is the 3rd wettest month of the year in Bozeman with around 49mm 1.9 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.5 hours of sunshine per day.

September temperatures in Bozeman

Bozeman average temperature in September

September rainfall

Bozeman average rain in September

September hourly sunshine

Bozeman 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 Bozeman in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Bozeman weather stats

Bozeman weather statistics
Hottest month: July 27.7°C 81.9°F
Driest month: February 22mm 0.9ins
Sunniest month: July 12.8hrs
Coldest month: January -1.4°C 29.5°F
Wettest month: May 79mm 3.1ins
Map showing location of Bozeman (45.67965, -111.03856) Bozeman map pin © Google

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