Chicago weather in May 2025

Expect daytime maximum temperatures of 21°C in Chicago in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 84 mm of rainfall in the month.

  • 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

More about Chicago

Chicago by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Illinois

TUI discount code: up to £300 off 2025/2026 holidays

  • Save up to £300 on package holidays in 2025/2026
  • Book in TUI sale. Discount varies by spend. T&Cs apply
  • Travel between 1st May 2025 & 31st Oct 2026 (inclusive)
Show discount codeShow discount code ******ALE
Redeem TUI discount code >>

Expires at 10:00 on Friday 28th Feb 2025 · View all TUI offers

TUITUI deal finder

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^