Deadwood Weather in September

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

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

September is in the fall / autumn in Deadwood and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (71°F), whilst at night 7°C (44°F) is normal.

Deadwood weather averages (imperial / metric)
Daytime temperature 21.9°C 71.4°F
Nightly temperature 6.5°C 43.7°F
Average temperature 14.2°C 57.6°F
Daily sunshine 9.2 hrs
Avg rainfall 31 mm 1.2 ins
Rainy days 8 days
Sea temperature 15.7°C 60.3°F
Humidity 55%
Windspeed 17.6kph 11 mph

On average September is the 6th wettest month of the year in Deadwood with around 31mm 1.2 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 9.2 hours of sunshine per day.

September temperatures in Deadwood

Deadwood average temperature in September

September rainfall

Deadwood average rain in September

September hourly sunshine

Deadwood 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 Deadwood 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

Deadwood weather stats

Deadwood weather statistics
Hottest month: July 29°C 84.2°F
Driest month: January 10mm 0.4ins
Sunniest month: August 11hrs
Coldest month: January -0.4°C 31.3°F
Wettest month: June 76mm 3ins
Map showing location of Deadwood (44.37665, -103.72964) Deadwood map pin © Google

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