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Decatur weather in August 2025
Expect 29°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Decatur in August. Check more long-term weather averages for Decatur in August before you book your next holiday to Illinois in 2025/2026.
- 2929°C max day temperature
- 9 hours of sunshine per day
- 88 days with some rainfall
- 1717°C min night temperature
- 1414 hours of daylight per day
- MModerate heat & humidity
- 9393 mm of monthly rainfall
- 88 (Very High) UV index
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Expires at 23:59 on Wednesday 31st Dec 2025 · View all Avalon Waterways offers
The August weather guide for Illinois (Decatur) 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 Decatur in August?
Daytime temperatures usually reach 29°C in Decatur in August with moderate heat and humidity, falling to 17°C at night.
How sunny is it in Decatur in August?
There are normally 9 hours of bright sunshine each day in Decatur in August - that's 67% of daylight hours.
Does it rain in Decatur in August?
There are usually 8 days with some rain in Decatur in August and the average monthly rainfall is 93mm.
Decatur August sunrise & sunset times
Browse the sunrise and sunset times for Decatur in August 2025. Select a month to view Decatur sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Friday, 1st August 2025 | 04:55 | 19:09 |
Saturday, 16th August 2025 | 05:09 | 18:50 |
Sunday, 31st August 2025 | 05:23 | 18:28 |
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