Decatur, Illinois 7-day weather forecast

Written by:
June 8, 2026
ESOlex // Shutterstock

Decatur, Illinois 7-day weather forecast

created the forecast for Decatur, Illinois using data from . This week's high is 89 掳F on Sunday, while the low is 63 掳F on Wednesday. There are expected to be 3 sunny days and rain on 4 days this week.

There are currently no weather alerts.

Monday, August 3

- High of 84 掳F, low of 64 掳F (67% humidity)
- Sunny with a 0% chance of rain
- Very high risk of harm from sun exposure (9 UV index)
- Gentle breeze (8 mph wind)
- Sunrise at 5:56 AM, sunset at 8:07 PM
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Tuesday, August 4

- High of 83 掳F, low of 64 掳F (64% humidity)
- Sunny with a 0% chance of rain
- Very high risk of harm from sun exposure (9 UV index)
- Gentle breeze (8 mph wind)
- Sunrise at 5:57 AM, sunset at 8:06 PM
2 / 6
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Wednesday, August 5

- High of 84 掳F, low of 63 掳F (66% humidity)
- Fair with a 0% chance of rain
- Very high risk of harm from sun exposure (9 UV index)
- Gentle breeze (12 mph wind)
- Sunrise at 5:58 AM, sunset at 8:05 PM
- Last quarter moon
3 / 6
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Thursday, August 6

- High of 78 掳F, low of 67 掳F (92% humidity)
- Overcast with a 100% chance of rain (13 mm of rain)
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (8 mph wind)
- Sunrise at 5:59 AM, sunset at 8:04 PM
4 / 6
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Friday, August 7

- High of 83 掳F, low of 68 掳F (71% humidity)
- Overcast with a 100% chance of rain (1 mm of rain)
- Light breeze (5 mph wind)
- Sunrise at 6:00 AM, sunset at 8:03 PM
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Saturday, August 8

- High of 88 掳F, low of 70 掳F (72% humidity)
- Partly cloudy with a 85% chance of rain (1 mm of rain)
- Gentle breeze (12 mph wind)
- Sunrise at 6:01 AM, sunset at 8:01 PM
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6 / 6
Deborah Kolb // Shutterstock

Sunday, August 9

- High of 89 掳F, low of 71 掳F (64% humidity)
- Partly sunny with a 20% chance of rain (0 mm of rain)
- Moderate breeze (15 mph wind)
- Sunrise at 6:02 AM, sunset at 8:00 PM

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