Columbus Weather in September

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

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

September is in the fall / autumn in Columbus and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 21°C (70°F), whilst at night 6°C (43°F) is normal.

Columbus weather averages (imperial / metric)
Daytime temperature 21.4°C 70.4°F
Nightly temperature 6.1°C 42.9°F
Average temperature 13.7°C 56.7°F
Daily sunshine 9.4 hrs
Avg rainfall 40 mm 1.6 ins
Rainy days 7 days
Sea temperature 14.5°C 58.1°F
Humidity 51%
Windspeed 15.8kph 10 mph

On average September is the 4th wettest month of the year in Columbus with around 40mm 1.6 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 9.4 hours of sunshine per day.

September temperatures in Columbus

Columbus average temperature in September

September rainfall

Columbus average rain in September

September hourly sunshine

Columbus 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 Columbus 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

Columbus weather stats

Columbus weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: February 17mm 0.7ins
Sunniest month: July 12.5hrs
Coldest month: January 0.1°C 32.2°F
Wettest month: May 75mm 3ins
Map showing location of Columbus (45.63661, -109.25211) Columbus map pin © Google

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