Armour Weather in September

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

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

September is in the fall / autumn in Armour and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (76°F), whilst at night 9°C (48°F) is normal.

Armour weather averages (imperial / metric)
Daytime temperature 24.6°C 76.3°F
Nightly temperature 9°C 48.2°F
Average temperature 16.8°C 62.2°F
Daily sunshine 9.3 hrs
Avg rainfall 56 mm 2.2 ins
Rainy days 7 days
Sea temperature 16.9°C 62.5°F
Humidity 65%
Windspeed 17.6kph 11 mph

On average September is the 6th wettest month of the year in Armour with around 56mm 2.2 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 Armour

Armour average temperature in September

September rainfall

Armour average rain in September

September hourly sunshine

Armour 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 Armour 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

Armour weather stats

Armour weather statistics
Hottest month: July 31°C 87.8°F
Driest month: January 11mm 0.4ins
Sunniest month: July 12.4hrs
Coldest month: January -2.5°C 27.5°F
Wettest month: June 91mm 3.6ins
Map showing location of Armour (43.3186, -98.34675) Armour map pin © Google

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