Chicago weather in August 2025

Expect 82°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Chicago in August. Check more long-term weather averages for Chicago in August before you book your next holiday to Illinois in 2025/2026.

  • 82°F maximum daytime temperature in August in Chicago82
    82°F max day temperature
  • 9 hours of sunshine per day
  • 9 days with some rainfall in August in Chicago9
    9 days with some rainfall
  • 61°F minimum night-time temperature in August in Chicago61
    61°F min night temperature
  • 14 hours of daylight per day in August in Chicago14
    14 hours of daylight per day
  • Moderate heat & humidity in August in ChicagoM
    Moderate heat & humidity
  • 3.8 inches monthly rainfall in August in Chicago3.8
    3.8 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Chicago8
    8 (Very High) UV index
  • 70°F sea temperature in August in Chicago70
    70°F sea temperature

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The August 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)  |  Imperial (°F)

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More about the USA

How hot is it in Chicago in August?

Daytime temperatures usually reach 82°F in Chicago in August with moderate heat and humidity, falling to 61°F at night.

How sunny is it in Chicago in August?

There are normally 9 hours of bright sunshine each day in Chicago in August - that's 67% of daylight hours.

How warm is the sea around Chicago in August?

The average sea temperature around Chicago in August is 70°F.

Does it rain in Chicago in August?

There are usually 9 days with some rain in Chicago in August and the average monthly rainfall is 3.8 inches.

Chicago August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:45 19:08
Saturday, 16th August 2025 05:00 18:49
Sunday, 31st August 2025 05:16 18:25

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