Illinois weather in July 2025

Expect daytime maximum temperatures of 29°C in Illinois in July based on long-term weather averages. There are 10 hours of sunshine per day on average with 10 days with some rainfall and typically 100 mm of rainfall in the month.

  • 29°C maximum daytime temperature in July in Illinois (Chicago)29
    29°C max day temperature
  • 10 hours of sunshine per day
  • 10 days with some rainfall in July in Illinois (Chicago)10
    10 days with some rainfall
  • 17°C minimum night-time temperature in July in Illinois (Chicago)17
    17°C min night temperature
  • 15 hours of daylight per day in July in Illinois (Chicago)15
    15 hours of daylight per day
  • Moderate heat & humidity in July in Illinois (Chicago)M
    Moderate heat & humidity
  • 100 mm monthly rainfall in July in Illinois (Chicago)100
    100 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in July in Illinois (Chicago)9
    9 (Very High) UV index
  • 19°C sea temperature in July in Illinois (Chicago)19
    19°C sea temperature

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

All Illinois destinations

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

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How hot is it in Illinois in July?

Daytime temperatures usually reach 29°C in Chicago, Illinois in July with moderate heat and humidity, falling to 17°C at night.

How sunny is it in Illinois in July?

There are normally 10 hours of bright sunshine each day in Chicago, Illinois in July - that's 69% of daylight hours.

How warm is the sea around Illinois in July?

The average sea temperature around Chicago, Illinois in July is 19°C.

Does it rain in Illinois in July?

There are usually 10 days with some rain in Chicago, Illinois in July and the average monthly rainfall is 100mm.

Illinois July sunrise & sunset times

Browse the sunrise and sunset times for Illinois in July 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 July 2025 04:19 19:29
Wednesday, 16th July 2025 04:30 19:23
Thursday, 31st July 2025 04:44 19:09

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