Fort Benton Weather in September

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

The climate in Fort Benton during September can be summarized as mild and dry.

September is in the fall / autumn in Fort Benton 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.

Fort Benton weather averages (imperial / metric)
Daytime temperature 21.1°C 70°F
Nightly temperature 5.9°C 42.6°F
Average temperature 13.5°C 56.3°F
Daily sunshine 9.3 hrs
Avg rainfall 27 mm 1 ins
Rainy days 7 days
Sea temperature 13.4°C 56.1°F
Humidity 54%
Windspeed 16.9kph 11 mph

On average September is the 6th wettest month of the year in Fort Benton with around 27mm 1 inches of rain making it a 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 9.3 hours of sunshine per day.

September temperatures in Fort Benton

Fort Benton average temperature in September

September rainfall

Fort Benton average rain in September

September hourly sunshine

Fort Benton 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 Fort Benton 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

Fort Benton weather stats

Fort Benton weather statistics
Hottest month: July 28.1°C 82.6°F
Driest month: February 12mm 0.5ins
Sunniest month: July 13.4hrs
Coldest month: January -2.3°C 27.9°F
Wettest month: June 72mm 2.8ins
Map showing location of Fort Benton (47.8183, -110.66744) Fort Benton map pin © Google

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