Decatur, Illinois 7-day weather forecast

Written by:
March 23, 2026
ESOlex // Shutterstock

Decatur, Illinois 7-day weather forecast

Stacker created the forecast for Decatur, Illinois using data from OpenWeather. This week's high is 79 °F on Tuesday, while the low is 37 °F on Sunday. There is expected to be 1 sunny day and rain on 5 days this week.

There are currently no weather alerts.

Monday, March 30

- High of 78 °F, low of 55 °F (57% humidity)
- Mostly cloudy with a 0% chance of rain
- High risk of harm from sun exposure (6 UV index)
- Fresh breeze (21 mph wind)
- Sunrise at 6:42 AM, sunset at 7:17 PM
1 / 6
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Tuesday, March 31

- High of 79 °F, low of 63 °F (69% humidity)
- Overcast with a 100% chance of rain (5 mm of rain)
- High risk of harm from sun exposure (5 UV index)
- Fresh breeze (22 mph wind)
- Sunrise at 6:41 AM, sunset at 7:18 PM
2 / 6
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Wednesday, April 1

- High of 76 °F, low of 58 °F (66% humidity)
- Overcast with a 100% chance of rain (2 mm of rain)
- Fresh breeze (20 mph wind)
- Sunrise at 6:39 AM, sunset at 7:19 PM
- Full moon
3 / 6
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Thursday, April 2

- High of 75 °F, low of 67 °F (79% humidity)
- Overcast with a 100% chance of rain (9 mm of rain)
- Moderate risk of harm from sun exposure (2 UV index)
- Strong breeze (25 mph wind)
- Sunrise at 6:38 AM, sunset at 7:20 PM
4 / 6
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Friday, April 3

- High of 73 °F, low of 58 °F (69% humidity)
- Mostly cloudy with a 100% chance of rain (4 mm of rain)
- Moderate risk of harm from sun exposure (3 UV index)
- Moderate breeze (15 mph wind)
- Sunrise at 6:36 AM, sunset at 7:21 PM
5 / 6
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Saturday, April 4

- High of 66 °F, low of 44 °F (75% humidity)
- Overcast with a 100% chance of rain (7 mm of rain)
- Moderate risk of harm from sun exposure (3 UV index)
- Moderate breeze (17 mph wind)
- Sunrise at 6:34 AM, sunset at 7:22 PM
6 / 6
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Sunday, April 5

- High of 55 °F, low of 37 °F (52% humidity)
- Sunny with a 0% chance of rain
- Moderate risk of harm from sun exposure (3 UV index)
- Gentle breeze (11 mph wind)
- Sunrise at 6:33 AM, sunset at 7:23 PM

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