Weather in May 2025

Illinois weather in May 2025

The temperatures in Illinois in May are usually low and can range between 12°C and 19°C.

You can expect about 3 to 8 days of rain in Illinois during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Our weather forecast can give you a great sense of what weather to expect in Illinois in May 2025.

If you’re planning to visit Illinois in the near future, we highly recommend that you review the 14 day weather forecast for Illinois before you arrive.

Temperatures
Temperatures
19° / 12°
Rainy Days
Rainy Days
7
Snowy Days
Snowy Days
0
Dry Days
Dry Days
24
Rainfall
Rainfall
98
mm
9.5
Sun Hours
9.5
Hrs

Illinois annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January -2° / -7° 5 11 15 39 mm
Awful
February 0° / -6° 4 11 14 41 mm
Awful
March 7° / 1° 6 19 6 55 mm
Bad
April 12° / 5° 7 21 3 79 mm
Awful
May 19° / 12° 7 24 0 98 mm
Ok
June 24° / 17° 7 23 0 128 mm
Good
July 27° / 20° 7 24 0 114 mm
Good
August 27° / 19° 5 26 0 100 mm
Perfect
September 24° / 16° 4 26 0 64 mm
Perfect
October 16° / 10° 5 25 0 65 mm
Good
November 9° / 3° 4 22 4 40 mm
Bad
December 3° / -2° 5 16 10 38 mm
Awful
Temperatures in Illinois in May
Rain in Illinois in May

Recommended Hotels in Illinois

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Weather in Illinois in May - FAQ

What is the average temperature in Illinois in May?
The average temperature in Illinois in May is 12/19° C.
What is the chance of rain in Illinois in May?
On average, there are 7 rainy days in Illinois during May.
Weather wise, is May a good time to visit Illinois?
The weather in Illinois in May is ok.
Can it snow in Illinois in May?
On average, there are 0 snowy days in Illinois in May.
Cities in Illinois

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More about the weather in Illinois