Clark Weather in September

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

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

September is in the fall / autumn in Clark and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (71°F), whilst at night 8°C (46°F) is normal.

Clark weather averages (imperial / metric)
Daytime temperature 21.9°C 71.4°F
Nightly temperature 7.7°C 45.9°F
Average temperature 14.8°C 58.6°F
Daily sunshine 9 hrs
Avg rainfall 48 mm 1.9 ins
Rainy days 8 days
Sea temperature 16.4°C 61.6°F
Humidity 68%
Windspeed 18.4kph 11 mph

On average September is the 6th wettest month of the year in Clark with around 48mm 1.9 inches of rain making it a reasonably dry 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 9 hours of sunshine per day.

September temperatures in Clark

Clark average temperature in September

September rainfall

Clark average rain in September

September hourly sunshine

Clark 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 Clark 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

Clark weather stats

Clark weather statistics
Hottest month: July 28.6°C 83.5°F
Driest month: January 14mm 0.6ins
Sunniest month: July 12.3hrs
Coldest month: January -6.7°C 19.9°F
Wettest month: June 91mm 3.6ins
Map showing location of Clark (44.87774, -97.73314) Clark map pin © Google

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