Flandreau Weather in September

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

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

September is in the fall / autumn in Flandreau and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 8°C (46°F) is normal.

Flandreau weather averages (imperial / metric)
Daytime temperature 22.5°C 72.5°F
Nightly temperature 7.9°C 46.2°F
Average temperature 15.2°C 59.4°F
Daily sunshine 8.7 hrs
Avg rainfall 69 mm 2.7 ins
Rainy days 9 days
Sea temperature 16.5°C 61.8°F
Humidity 70%
Windspeed 18.4kph 11 mph

On average September is the 5th wettest month of the year in Flandreau with around 69mm 2.7 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.7 hours of sunshine per day.

September temperatures in Flandreau

Flandreau average temperature in September

September rainfall

Flandreau average rain in September

September hourly sunshine

Flandreau 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 Flandreau 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

Flandreau weather stats

Flandreau weather statistics
Hottest month: July 29.3°C 84.7°F
Driest month: January 11mm 0.4ins
Sunniest month: July 12hrs
Coldest month: January -6°C 21.2°F
Wettest month: June 98mm 3.9ins
Map showing location of Flandreau (44.04942, -96.59532) Flandreau map pin © Google

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