Champaign weather in August 2026

Q: How hot is it in Champaign in August?

Daytime temperatures usually reach 28°C in Champaign in August with moderate heat and humidity, falling to 16°C at night.

Q: How sunny is it in Champaign in August?

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

Q: How warm is the sea around Champaign in August?

The average sea temperature around Champaign in August is 21°C.

Q: Does it rain in Champaign in August?

There are usually 9 days with some rain in Champaign in August and the average monthly rainfall is 97mm.

Expect daytime maximum temperatures of 28°C in Champaign, Illinois in August based on long-term weather averages. There are 9 hours of sunshine per day on average with typically 97 mm of rainfall in the month.

28
28°C max day temperature
9
9 hours of sunshine per day
9
9 days with some rainfall
17
17°C min night temperature
14
14 hours of daylight per day
M
Moderate heat & humidity
97
97 mm of monthly rainfall
8
8 (Very High) UV index

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The August weather guide for Illinois (Champaign) 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)