![National Oceanic and Atmospheric Administration](/build/images/header/noaa.d87e0251.png)
![National Weather Service](/build/images/header/nws.4e6585d8.png)
![United States Department of Commerce](/build/images/header/doc.b38ba91a.png)
News Headlines
- Survey Information from June 13, 2024 Severe Weather
- Looking for additional help in using our new NWPS page? Check out our Quick Start Guide!
- NWS Soliciting Comments on Discontinuation of Haines Index and Lightning Activity Level (LAL) from Fire Weather Forecasts
- This is Lightning Safety Awareness Week
- New and Upcoming NWS Web Page Changes
Hazardous Weather Conditions
Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.![](newimages/large/few.png)
A Few Clouds
72°F
22°C
Humidity | 57% |
Wind Speed | S 13 mph |
Barometer | 29.95 in (1013.6 mb) |
Dewpoint | 56°F (13°C) |
Visibility | 10.00 mi |
Last update | 16 Jun 5:54 am CDT |
Extended Forecast for
Illiopolis IL
Today
High: 94 °F
Mostly Sunny
Tonight
Low: 74 °F
Mostly Clear
Monday
High: 94 °F
Sunny then
Slight Chance
T-stormsMonday Night
Low: 74 °F
Partly Cloudy
Tuesday
High: 89 °F
Mostly Sunny
then Chance
T-stormsTuesday Night
Low: 72 °F
Partly Cloudy
Juneteenth
High: 92 °F
Mostly Sunny
Wednesday Night
Low: 72 °F
Partly Cloudy
Thursday
High: 94 °F
Mostly Sunny
Detailed Forecast
Today
Mostly sunny, with a high near 94. Heat index values as high as 101. South southwest wind 11 to 15 mph, with gusts as high as 22 mph.
Tonight
Mostly clear, with a low around 74. South wind 8 to 10 mph, with gusts as high as 20 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Heat index values as high as 102. South wind 10 to 16 mph, with gusts as high as 24 mph.
Monday Night
Partly cloudy, with a low around 74. South wind 13 to 16 mph, with gusts as high as 24 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. South wind 13 to 18 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 72. South wind 7 to 14 mph, with gusts as high as 23 mph.
Juneteenth
Mostly sunny, with a high near 92. South wind 6 to 11 mph, with gusts as high as 16 mph.
Wednesday Night
Partly cloudy, with a low around 72.
Thursday
Mostly sunny, with a high near 94.
Thursday Night
Partly cloudy, with a low around 73.
Friday
Mostly sunny and hot, with a high near 95.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Mostly sunny, with a high near 94.
Additional Forecasts and Information
Click Map For Forecast
ABOUT THIS FORECAST
Point Forecast:
Illiopolis IL
39.83°N 89.23°W (Elev. 568 ft)
39.83°N 89.23°W (Elev. 568 ft)
5:42 am CDT Jun 16, 2024
6am CDT Jun 16, 2024-6pm CDT Jun 22, 2024