Illinois weather in August 2024

Expect 82°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Illinois in August. Check more long-term weather averages for Illinois in August before you book your next holiday to Illinois in 2024/2025.

82
82°F max day temperature
9
9 hours of sunshine per day
9
9 days with some rainfall
61
61°F min night temperature
14
14 hours of daylight per day
M
Moderate heat & humidity
3.8
3.8 inches of monthly rainfall
8
8 (Very High) UV index
70
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.

Top Illinois destinations

Below are average maximum temperatures at popular destinations in Illinois in August. Select a destination to see more weather parameters.

84
Springfield
82
Chicago

All Illinois destinations

Metric (°C) | Imperial (°F)

More about the USA

How hot is it in Illinois in August?

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

How sunny is it in Illinois in August?

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

How warm is the sea around Illinois in August?

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

Does it rain in Illinois in August?

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

Illinois August sunrise & sunset times

Browse the sunrise and sunset times for Illinois in August 2024. 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.

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

Date	Sunrise times	Sunset times
Thursday, 1st August 2024	05:45	20:08
Friday, 16th August 2024	06:00	19:48
Saturday, 31st August 2024	06:16	19:25

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Illinois - quick facts
Flight time^✝	8.5 hours
Time difference	UK -6 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Culture
Tourist info	Illinois Department of Commerce & Economic Opportunity