Illinois weather in April 2025

Expect 15°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Illinois in April. Check more long-term weather averages for Illinois in April before you book your next holiday to Illinois in 2025/2026.

  • 15°C maximum daytime temperature in April in Illinois (Chicago)15
    15°C max day temperature
  • 7 hours of sunshine per day
  • 13 days with some rainfall in April in Illinois (Chicago)13
    13 days with some rainfall
  • 3°C minimum night-time temperature in April in Illinois (Chicago)3
    3°C min night temperature
  • 13 hours of daylight per day in April in Illinois (Chicago)13
    13 hours of daylight per day
  • No heat & humidity in April in Illinois (Chicago)0
    No heat & humidity
  • 96 mm monthly rainfall in April in Illinois (Chicago)96
    96 mm of monthly rainfall
  • UV (maximum) index 6 (High) in April in Illinois (Chicago)6
    6 (High) UV index
  • 3°C sea temperature in April in Illinois (Chicago)3
    3°C sea temperature

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The April 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 April. Select a holiday destination to see more weather parameters.

All Illinois destinations

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

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How warm is it in Illinois in April?

Daytime temperatures usually reach 15°C in Chicago, Illinois in April, falling to 3°C at night.

How sunny is it in Illinois in April?

There are normally 7 hours of bright sunshine each day in Chicago, Illinois in April - that's 55% of daylight hours.

Is the sea cold around Illinois in April?

The average sea temperature around Chicago, Illinois in April is 3°C.

Does it rain in Illinois in April?

There are usually 13 days with some rain in Chicago, Illinois in April and the average monthly rainfall is 96mm.

Illinois April sunrise & sunset times

Browse the sunrise and sunset times for Illinois in April 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
Tuesday, 1st April 2025 05:33 18:16
Tuesday, 15th April 2025 05:10 18:32
Wednesday, 30th April 2025 04:48 18:49

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