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Chicago weather in August 2025
Expect 28°C 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.
- 2828°C max day temperature
- 9 hours of sunshine per day
- 99 days with some rainfall
- 1616°C min night temperature
- 1414 hours of daylight per day
- MModerate heat & humidity
- 9797 mm of monthly rainfall
- 88 (Very High) UV index
- 2121°C 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 / mm) | Imperial (°F / inches)
More about the USA
How hot is it in Chicago in August?
Daytime temperatures usually reach 28°C in Chicago in August with moderate heat and humidity, falling to 16°C 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 21°C.
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 97mm.
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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