Decatur, Illinois 7-day weather forecast

Written by:
August 25, 2025
ESOlex // Shutterstock

Decatur, Illinois 7-day weather forecast

Stacker created the forecast for Decatur, Illinois using data from OpenWeather. This week's high is 80 °F on Thursday, while the low is 48 °F on Tuesday. There are expected to be 5 sunny days and rain on 2 days this week.

There are currently no weather alerts.

Monday, August 25

- High of 72 °F, low of 55 °F (47% humidity)
- Sunny with a 0% chance of rain
- Very high risk of harm from sun exposure (8 UV index)
- Moderate breeze (13 mph wind)
- Sunrise at 6:17 AM, sunset at 7:38 PM
1 / 6
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Tuesday, August 26

- High of 72 °F, low of 48 °F (45% humidity)
- Sunny with a 0% chance of rain
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (10 mph wind)
- Sunrise at 6:18 AM, sunset at 7:36 PM
2 / 6
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Wednesday, August 27

- High of 75 °F, low of 50 °F (45% humidity)
- Fair with a 0% chance of rain
- Very high risk of harm from sun exposure (7 UV index)
- Gentle breeze (9 mph wind)
- Sunrise at 6:19 AM, sunset at 7:35 PM
3 / 6
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Thursday, August 28

- High of 80 °F, low of 56 °F (47% humidity)
- Fair with a 0% chance of rain
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (10 mph wind)
- Sunrise at 6:20 AM, sunset at 7:33 PM
4 / 6
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Friday, August 29

- High of 80 °F, low of 58 °F (47% humidity)
- Sunny with a 0% chance of rain
- Gentle breeze (10 mph wind)
- Sunrise at 6:21 AM, sunset at 7:32 PM
5 / 6
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Saturday, August 30

- High of 80 °F, low of 61 °F (46% humidity)
- Overcast with a 23% chance of rain (0 mm of rain)
- Gentle breeze (12 mph wind)
- Sunrise at 6:22 AM, sunset at 7:30 PM
6 / 6
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Sunday, August 31

- High of 73 °F, low of 63 °F (73% humidity)
- Overcast with a 100% chance of rain (3 mm of rain)
- Moderate breeze (14 mph wind)
- Sunrise at 6:23 AM, sunset at 7:29 PM
- First quarter moon

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