Sidney Weather in September

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

The climate in Sidney during September can be summarized as warm and a little damp.

September is in the fall / autumn in Sidney and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 25°C (77°F), whilst at night 12°C (53°F) is normal.

Sidney weather averages (imperial / metric)
Daytime temperature 24.9°C 76.7°F
Nightly temperature 11.8°C 53.2°F
Average temperature 18.3°C 64.9°F
Daily sunshine 8.6 hrs
Avg rainfall 95 mm 3.7 ins
Rainy days 9 days
Sea temperature 19.3°C 66.7°F
Humidity 72%
Windspeed 15.5kph 10 mph

On average September is the 5th wettest month of the year in Sidney with around 95mm 3.7 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 8.6 hours of sunshine per day.

September temperatures in Sidney

Sidney average temperature in September

September rainfall

Sidney average rain in September

September hourly sunshine

Sidney 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 Sidney 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

Sidney weather stats

Sidney weather statistics
Hottest month: July 30.8°C 87.4°F
Driest month: January 20mm 0.8ins
Sunniest month: July 11.5hrs
Coldest month: January -0.5°C 31.1°F
Wettest month: August 108mm 4.3ins
Map showing location of Sidney (40.74833, -95.6475) Sidney map pin © Google

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