Decatur, Illinois 7-day weather forecast

Written by:
June 8, 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 84 掳F on Wednesday, while the low is 55 掳F on Friday. There are expected to be 2 sunny days and rain on 4 days this week.

There are currently no weather alerts.

Monday, June 15

- High of 75 掳F, low of 57 掳F (52% humidity)
- Sunny with a 0% chance of rain
- Very high risk of harm from sun exposure (9 UV index)
- Gentle breeze (10 mph wind)
- Sunrise at 5:26 AM, sunset at 8:25 PM
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1 / 6
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Tuesday, June 16

- High of 73 掳F, low of 59 掳F (95% humidity)
- Mostly cloudy with a 100% chance of rain (5 mm of rain)
- High risk of harm from sun exposure (7 UV index)
- Moderate breeze (18 mph wind)
- Sunrise at 5:27 AM, sunset at 8:26 PM
2 / 6
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Wednesday, June 17

- High of 84 掳F, low of 56 掳F (76% humidity)
- Overcast with a 100% chance of rain (10 mm of rain)
- Very high risk of harm from sun exposure (9 UV index)
- Strong breeze (27 mph wind)
- Sunrise at 5:27 AM, sunset at 8:26 PM
3 / 6
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Thursday, June 18

- High of 74 掳F, low of 59 掳F (68% humidity)
- Partly cloudy with a 100% chance of rain (0 mm of rain)
- Very high risk of harm from sun exposure (9 UV index)
- Moderate breeze (17 mph wind)
- Sunrise at 5:27 AM, sunset at 8:26 PM
4 / 6
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Friday, June 19

- High of 69 掳F, low of 55 掳F (57% humidity)
- Sunny with a 0% chance of rain
- Moderate breeze (15 mph wind)
- Sunrise at 5:27 AM, sunset at 8:27 PM
5 / 6
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Saturday, June 20

- High of 74 掳F, low of 56 掳F (58% humidity)
- Mostly cloudy with a 0% chance of rain
- Moderate breeze (15 mph wind)
- Sunrise at 5:27 AM, sunset at 8:27 PM
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6 / 6
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Sunday, June 21

- High of 66 掳F, low of 62 掳F (99% humidity)
- Overcast with a 100% chance of rain (37 mm of rain)
- Moderate breeze (13 mph wind)
- Sunrise at 5:27 AM, sunset at 8:27 PM
- First quarter moon

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