Decatur, Illinois 7-day weather forecast

Written by:
January 26, 2026
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Decatur, Illinois 7-day weather forecast

created the forecast for Decatur, Illinois using data from . This week's high is 39 掳F on Friday, while the low is 9 掳F on Wednesday. There are expected to be 2 sunny days and precipitation on 0 days this week.

There are currently no weather alerts.

Monday, February 2

- High of 31 掳F, low of 17 掳F (79% humidity)
- Mostly sunny with a 0% chance of snow
- Moderate risk of harm from sun exposure (3 UV index)
- Gentle breeze (9 mph wind)
- Sunrise at 7:03 AM, sunset at 5:15 PM
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1 / 6
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Tuesday, February 3

- High of 30 掳F, low of 15 掳F (73% humidity)
- Overcast with a 0% chance of snow
- Gentle breeze (12 mph wind)
- Sunrise at 7:02 AM, sunset at 5:17 PM
2 / 6
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Wednesday, February 4

- High of 26 掳F, low of 9 掳F (78% humidity)
- Partly cloudy with a 0% chance of snow
- Moderate risk of harm from sun exposure (3 UV index)
- Light breeze (7 mph wind)
- Sunrise at 7:01 AM, sunset at 5:18 PM
3 / 6
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Thursday, February 5

- High of 31 掳F, low of 13 掳F (73% humidity)
- Mostly cloudy with a 0% chance of snow
- Moderate risk of harm from sun exposure (3 UV index)
- Gentle breeze (8 mph wind)
- Sunrise at 7:00 AM, sunset at 5:19 PM
4 / 6
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Friday, February 6

- High of 39 掳F, low of 20 掳F (69% humidity)
- Mostly cloudy with a 0% chance of rain
- Moderate risk of harm from sun exposure (3 UV index)
- Fresh breeze (20 mph wind)
- Sunrise at 6:59 AM, sunset at 5:20 PM
5 / 6
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Saturday, February 7

- High of 22 掳F, low of 12 掳F (35% humidity)
- Sunny with a 0% chance of snow
- Moderate risk of harm from sun exposure (3 UV index)
- Moderate breeze (14 mph wind)
- Sunrise at 6:58 AM, sunset at 5:21 PM
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6 / 6
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Sunday, February 8

- High of 28 掳F, low of 17 掳F (33% humidity)
- Mostly cloudy with a 0% chance of snow
- Moderate risk of harm from sun exposure (3 UV index)
- Light breeze (7 mph wind)
- Sunrise at 6:56 AM, sunset at 5:23 PM

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