Decatur, Illinois 7-day weather forecast

Written by:
September 29, 2025
ESOlex // Shutterstock

Decatur, Illinois 7-day weather forecast

Stacker created the forecast for Decatur, Illinois using data from OpenWeather. This week's high is 80 °F on Tuesday, while the low is 48 °F on Monday. There are expected to be 2 sunny days and rain on 1 day this week.

There are currently no weather alerts.

Monday, October 13

- High of 74 °F, low of 48 °F (51% humidity)
- Overcast with a 0% chance of rain
- Moderate risk of harm from sun exposure (3 UV index)
- Gentle breeze (8 mph wind)
- Sunrise at 7:04 AM, sunset at 6:19 PM
- Last quarter moon
1 / 6
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Tuesday, October 14

- High of 80 °F, low of 58 °F (35% humidity)
- Mostly sunny with a 0% chance of rain
- Moderate risk of harm from sun exposure (5 UV index)
- Gentle breeze (10 mph wind)
- Sunrise at 7:05 AM, sunset at 6:18 PM
2 / 6
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Wednesday, October 15

- High of 73 °F, low of 57 °F (45% humidity)
- Overcast with a 0% chance of rain
- Moderate risk of harm from sun exposure (5 UV index)
- Gentle breeze (9 mph wind)
- Sunrise at 7:06 AM, sunset at 6:16 PM
3 / 6
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Thursday, October 16

- High of 76 °F, low of 55 °F (33% humidity)
- Mostly cloudy with a 0% chance of rain
- Moderate risk of harm from sun exposure (4 UV index)
- Gentle breeze (10 mph wind)
- Sunrise at 7:07 AM, sunset at 6:15 PM
4 / 6
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Friday, October 17

- High of 78 °F, low of 57 °F (35% humidity)
- Overcast with a 0% chance of rain
- Moderate risk of harm from sun exposure (5 UV index)
- Moderate breeze (16 mph wind)
- Sunrise at 7:08 AM, sunset at 6:13 PM
5 / 6
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Saturday, October 18

- High of 71 °F, low of 58 °F (70% humidity)
- Overcast with a 100% chance of rain (10 mm of rain)
- Moderate risk of harm from sun exposure (5 UV index)
- Moderate breeze (17 mph wind)
- Sunrise at 7:09 AM, sunset at 6:12 PM
6 / 6
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Sunday, October 19

- High of 65 °F, low of 48 °F (24% humidity)
- Sunny with a 0% chance of rain
- Moderate risk of harm from sun exposure (5 UV index)
- Moderate breeze (17 mph wind)
- Sunrise at 7:10 AM, sunset at 6:10 PM

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