Winner Weather in September

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

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

September is in the fall / autumn in Winner and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (77°F), whilst at night 9°C (47°F) is normal.

Winner weather averages (imperial / metric)
Daytime temperature 25.1°C 77.2°F
Nightly temperature 8.5°C 47.3°F
Average temperature 16.8°C 62.2°F
Daily sunshine 9.5 hrs
Avg rainfall 42 mm 1.6 ins
Rainy days 7 days
Sea temperature 16.8°C 62.2°F
Humidity 60%
Windspeed 16.9kph 11 mph

On average September is the 6th wettest month of the year in Winner with around 42mm 1.6 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 9.5 hours of sunshine per day.

September temperatures in Winner

Winner average temperature in September

September rainfall

Winner average rain in September

September hourly sunshine

Winner 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 Winner 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

Winner weather stats

Winner weather statistics
Hottest month: July 31.7°C 89.1°F
Driest month: January 9mm 0.4ins
Sunniest month: July 12.3hrs
Coldest month: January -1.1°C 30°F
Wettest month: May 82mm 3.2ins
Map showing location of Winner (43.37667, -99.85901) Winner map pin © Google

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