Belle Fourche Weather in September

What's the weather like in Belle Fourche (South Dakota) in September 2025?

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

September is in the fall / autumn in Belle Fourche and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (74°F), whilst at night 7°C (45°F) is normal.

Belle Fourche weather averages (imperial / metric)
Daytime temperature 23.2°C 73.8°F
Nightly temperature 7.4°C 45.3°F
Average temperature 15.3°C 59.5°F
Daily sunshine 9.4 hrs
Avg rainfall 31 mm 1.2 ins
Rainy days 7 days
Sea temperature 15.7°C 60.3°F
Humidity 54%
Windspeed 17.3kph 11 mph

On average September is the 6th wettest month of the year in Belle Fourche with around 31mm 1.2 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 Belle Fourche

Belle Fourche average temperature in September

September rainfall

Belle Fourche average rain in September

September hourly sunshine

Belle Fourche 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 Belle Fourche 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

Belle Fourche weather stats

Belle Fourche weather statistics
Hottest month: July 30.7°C 87.3°F
Driest month: January 8mm 0.3ins
Sunniest month: August 11.3hrs
Coldest month: January -0.4°C 31.3°F
Wettest month: June 70mm 2.8ins
Map showing location of Belle Fourche (44.67137, -103.85215) Belle Fourche map pin © Google

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