Buffalo Weather in September

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

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

September is in the fall / autumn in Buffalo and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 6°C (43°F) is normal.

Buffalo weather averages (imperial / metric)
Daytime temperature 22.6°C 72.6°F
Nightly temperature 6.3°C 43.3°F
Average temperature 14.4°C 57.9°F
Daily sunshine 9.3 hrs
Avg rainfall 34 mm 1.3 ins
Rainy days 7 days
Sea temperature 15.1°C 59.2°F
Humidity 56%
Windspeed 17.3kph 11 mph

On average September is the 6th wettest month of the year in Buffalo with around 34mm 1.3 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 9.3 hours of sunshine per day.

September temperatures in Buffalo

Buffalo average temperature in September

September rainfall

Buffalo average rain in September

September hourly sunshine

Buffalo 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 Buffalo 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

Buffalo weather stats

Buffalo weather statistics
Hottest month: July 30°C 86°F
Driest month: January 7mm 0.3ins
Sunniest month: August 11.3hrs
Coldest month: January -2.3°C 27.9°F
Wettest month: June 75mm 3ins
Map showing location of Buffalo (45.58416, -103.54603) Buffalo map pin © Google

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