Decatur, Illinois 7-day weather forecast

Written by:
March 23, 2026
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Decatur, Illinois 7-day weather forecast

Stacker created the forecast for Decatur, Illinois using data from OpenWeather. This week's high is 74 °F on Thursday, while the low is 38 °F on Monday. There are expected to be 2 sunny days and rain on 3 days this week.

NWS Lincoln IL has issued a frost advisory until Monday at 08:00 AM.

Monday, April 20

- High of 62 °F, low of 38 °F (37% humidity)
- Sunny with a 0% chance of rain
- Very high risk of harm from sun exposure (7 UV index)
- Gentle breeze (12 mph wind)
- Sunrise at 6:10 AM, sunset at 7:38 PM
1 / 6
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Tuesday, April 21

- High of 73 °F, low of 50 °F (56% humidity)
- Overcast with a 21% chance of rain (0 mm of rain)
- High risk of harm from sun exposure (7 UV index)
- Fresh breeze (21 mph wind)
- Sunrise at 6:09 AM, sunset at 7:39 PM
2 / 6
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Wednesday, April 22

- High of 69 °F, low of 57 °F (67% humidity)
- Partly cloudy with a 25% chance of rain (0 mm of rain)
- Moderate risk of harm from sun exposure (4 UV index)
- Moderate breeze (16 mph wind)
- Sunrise at 6:07 AM, sunset at 7:40 PM
3 / 6
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Thursday, April 23

- High of 74 °F, low of 59 °F (51% humidity)
- Partly cloudy with a 0% chance of rain
- Very high risk of harm from sun exposure (8 UV index)
- Moderate breeze (18 mph wind)
- Sunrise at 6:06 AM, sunset at 7:41 PM
- First quarter moon
4 / 6
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Friday, April 24

- High of 70 °F, low of 59 °F (66% humidity)
- Overcast with a 100% chance of rain (42 mm of rain)
- Moderate breeze (17 mph wind)
- Sunrise at 6:05 AM, sunset at 7:42 PM
5 / 6
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Saturday, April 25

- High of 63 °F, low of 49 °F (44% humidity)
- Sunny with a 0% chance of rain
- Moderate breeze (13 mph wind)
- Sunrise at 6:03 AM, sunset at 7:43 PM
6 / 6
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Sunday, April 26

- High of 67 °F, low of 49 °F (52% humidity)
- Partly cloudy with a 0% chance of rain
- Moderate breeze (15 mph wind)
- Sunrise at 6:02 AM, sunset at 7:44 PM

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