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Illinois weather in May 2025
Expect 70°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Illinois in May. Check more long-term weather averages for Illinois in May before you book your next holiday to Illinois in 2025/2026.
- 7070°F max day temperature
- 9 hours of sunshine per day
- 1111 days with some rainfall
- 4848°F min night temperature
- 1515 hours of daylight per day
- 0No heat & humidity
- 3.33.3 inches of monthly rainfall
- 77 (High) UV index
- 4343°F sea temperature
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The May weather guide for Illinois (Chicago) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Top Illinois destinations
Below are average maximum temperatures at popular countries, regions and places in Illinois in May. Select a holiday destination to see more weather parameters.
All Illinois destinations
Metric (°C) | Imperial (°F)
More about the USA
How hot is it in Illinois in May?
Daytime temperatures usually reach 70°F in Chicago, Illinois in May, falling to 48°F at night.
How sunny is it in Illinois in May?
There are normally 9 hours of bright sunshine each day in Chicago, Illinois in May - that's 62% of daylight hours.
How warm is the sea around Illinois in May?
The average sea temperature around Chicago, Illinois in May is 43°F.
Does it rain in Illinois in May?
There are usually 11 days with some rain in Chicago, Illinois in May and the average monthly rainfall is 3.3 inches.
Illinois May sunrise & sunset times
Browse the sunrise and sunset times for Illinois in May 2025. Select a month to view Illinois sunrise and sunset times for the next 12 months. The Illinois sunrise and sunset times shown below are for Chicago.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Thursday, 1st May 2025 | 04:46 | 18:50 |
Friday, 16th May 2025 | 04:29 | 19:05 |
Saturday, 31st May 2025 | 04:18 | 19:19 |
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