Chicago weather in May 2025

Expect 21°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Chicago in May. Check more long-term weather averages for Chicago in May before you book your next holiday to Illinois in 2025/2026.

  • 21°C maximum daytime temperature in May in Chicago21
    21°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in Chicago11
    11 days with some rainfall
  • 9°C minimum night-time temperature in May in Chicago9
    9°C min night temperature
  • 15 hours of daylight per day in May in Chicago15
    15 hours of daylight per day
  • No heat & humidity in May in Chicago0
    No heat & humidity
  • 84 mm monthly rainfall in May in Chicago84
    84 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Chicago7
    7 (High) UV index
  • 6°C sea temperature in May in Chicago6
    6°C 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.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Chicago in May?

Daytime temperatures usually reach 21°C in Chicago in May, falling to 9°C at night.

How sunny is it in Chicago in May?

There are normally 9 hours of bright sunshine each day in Chicago in May - that's 62% of daylight hours.

Is the sea cold around Chicago in May?

The average sea temperature around Chicago in May is 6°C.

Does it rain in Chicago in May?

There are usually 11 days with some rain in Chicago in May and the average monthly rainfall is 84mm.

Chicago May sunrise & sunset times

Browse the sunrise and sunset times for Chicago in May 2025. Select a month to view Chicago sunrise and sunset times for the next 12 months.

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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