Winchester Weather in August

What's the weather like in Winchester (Illinois) in August 2025?

The climate in Winchester during August can be summarized as hot, humid and a little damp.

August is in the summer in Winchester and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 29°C (85°F), whilst at night 17°C (62°F) is normal.

Winchester weather averages (imperial / metric)
Daytime temperature 29.2°C 84.5°F
Nightly temperature 16.9°C 62.3°F
Average temperature 23°C 73.4°F
Daily sunshine 9.7 hrs
Avg rainfall 83 mm 3.3 ins
Rainy days 8 days
Sea temperature 21.8°C 71.3°F
Humidity 72%
Windspeed 13.7kph 9 mph

On average August is the 6th wettest month of the year in Winchester with around 83mm 3.3 inches of rain making it a a little damp 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 9.7 hours of sunshine per day.

August temperatures in Winchester

Winchester average temperature in August

August rainfall

Winchester average rain in August

August hourly sunshine

Winchester average rain in August

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 Winchester in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Winchester weather stats

Winchester weather statistics
Hottest month: July 30.1°C 86.2°F
Driest month: January 37mm 1.5ins
Sunniest month: July 10.8hrs
Coldest month: January 0.7°C 33.3°F
Wettest month: May 112mm 4.4ins
Map showing location of Winchester (39.62977, -90.45624) Winchester map pin © Google

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