Spirit Lake Weather in September

What's the weather like in Spirit Lake (Iowa) in September 2025?

The climate in Spirit Lake during September can be summarized as mild and a little damp.

September is in the fall / autumn in Spirit Lake and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 9°C (48°F) is normal.

Spirit Lake weather averages (imperial / metric)
Daytime temperature 22.3°C 72.1°F
Nightly temperature 8.7°C 47.7°F
Average temperature 15.5°C 59.9°F
Daily sunshine 8.5 hrs
Avg rainfall 80 mm 3.2 ins
Rainy days 9 days
Sea temperature 17.3°C 63.2°F
Humidity 72%
Windspeed 17.3kph 11 mph

On average September is the 5th wettest month of the year in Spirit Lake with around 80mm 3.2 inches of rain making it a a little damp 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 8.5 hours of sunshine per day.

September temperatures in Spirit Lake

Spirit Lake average temperature in September

September rainfall

Spirit Lake average rain in September

September hourly sunshine

Spirit Lake 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 Spirit Lake 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

Spirit Lake weather stats

Spirit Lake weather statistics
Hottest month: July 28.4°C 83.1°F
Driest month: January 17mm 0.7ins
Sunniest month: July 11.7hrs
Coldest month: January -5.5°C 22.1°F
Wettest month: June 113mm 4.4ins
Map showing location of Spirit Lake (43.42218, -95.10222) Spirit Lake map pin © Google

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