
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
You may also like:
Highest-rated breakfast restaurants in the Decatur, Illinois area by diners

1 / 6
LeManna // Shutterstock
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
- 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
alisalipa // Shutterstock
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
- 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
loreanto // Shutterstock
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
- 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
John Cartwright // Shutterstock
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
- 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
LeManna // Shutterstock
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
- 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
You may also like:
Car insurance rates in Decatur, Illinois October 2025

6 / 6
New Africa // Shutterstock
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
- 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