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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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Decatur by month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Recommended for Illinois
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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