Chester Weather in May

What's the weather like in Chester (Illinois) in May 2025?

The climate in Chester during May can be summarized as warm and damp.

May is in the spring in Chester and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (77°F), whilst at night 12°C (54°F) is normal.

Chester weather averages (imperial / metric)
Daytime temperature 25.2°C 77.4°F
Nightly temperature 12.2°C 54°F
Average temperature 18.7°C 65.7°F
Daily sunshine 9.5 hrs
Avg rainfall 116 mm 4.6 ins
Rainy days 10 days
Sea temperature 14.9°C 58.9°F
Humidity 67%
Windspeed 15.5kph 10 mph

On average May is the wettest month of the year in Chester with around 116mm 4.6 inches of rain making it a damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.5 hours of sunshine per day.

May temperatures in Chester

Chester average temperature in May

May rainfall

Chester average rain in May

May hourly sunshine

Chester average rain in May

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 Chester in May 2025.

Other monthly averages

Best places to visit in May

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Chester weather stats

Chester weather statistics
Hottest month: July 31.7°C 89.1°F
Driest month: January 56mm 2.2ins
Sunniest month: July 10.9hrs
Coldest month: January 4.1°C 39.4°F
Wettest month: May 116mm 4.6ins
Map showing location of Chester (37.91366, -89.82205) Chester map pin © Google

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