Waterloo Weather in September

What's the weather like in Waterloo (Illinois) in September 2024?

The climate in Waterloo during September can be summarized as warm, humid and reasonably dry.

September is in the fall / autumn in Waterloo and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (80°F), whilst at night 15°C (58°F) is normal.

Waterloo weather averages (imperial / metric)
Daytime temperature 26.5°C 79.6°F
Nightly temperature 14.6°C 58.2°F
Average temperature 20.5°C 68.9°F
Daily sunshine 8.6 hrs
Avg rainfall 80 mm 3.1 ins
Rainy days 8 days
Sea temperature 21.2°C 70.2°F
Humidity 72%
Windspeed 13.7kph 9 mph

On average September is the 5th driest month of the year in Waterloo with around 80mm 3.1 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 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 Waterloo

Waterloo average temperature in September

September rainfall

Waterloo average rain in September

September hourly sunshine

Waterloo 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 Waterloo in September 2024.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Waterloo weather stats

Waterloo weather statistics
Hottest month: July 31.3°C 88.3°F
Driest month: January 49mm 1.9ins
Sunniest month: July 10.8hrs
Coldest month: January 3.3°C 37.9°F
Wettest month: May 106mm 4.2ins
Map showing location of Waterloo (38.33589, -90.14983) Waterloo map pin © Google

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