Bismarck Weather in September

What's the weather like in Bismarck (Missouri) in September 2025?

The climate in Bismarck during September can be summarized as warm and a little damp.

September is in the fall / autumn in Bismarck and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (80°F), whilst at night 13°C (55°F) is normal.

Bismarck weather averages (imperial / metric)
Daytime temperature 26.4°C 79.5°F
Nightly temperature 13°C 55.4°F
Average temperature 19.7°C 67.5°F
Daily sunshine 8.5 hrs
Avg rainfall 91 mm 3.6 ins
Rainy days 8 days
Sea temperature 22°C 71.6°F
Humidity 72%
Windspeed 13.7kph 9 mph

On average September is the 5th driest month of the year in Bismarck with around 91mm 3.6 inches of rain making it a a little damp 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 8.5 hours of sunshine per day.

September temperatures in Bismarck

Bismarck average temperature in September

September rainfall

Bismarck average rain in September

September hourly sunshine

Bismarck 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 Bismarck 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

Bismarck weather stats

Bismarck weather statistics
Hottest month: July 31.2°C 88.2°F
Driest month: January 54mm 2.1ins
Sunniest month: July 10.8hrs
Coldest month: January 4°C 39.2°F
Wettest month: May 112mm 4.4ins
Map showing location of Bismarck (37.76922, -90.62485) Bismarck map pin © Google

Locations nearby

Top United States locations