Hazardous Weather Conditions
Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Fair
90°F
32°C
| Humidity | 52% |
| Wind Speed | W 15 G 26 mph |
| Barometer | 30.00 in (1015.0 mb) |
| Dewpoint | 70°F (21°C) |
| Visibility | 10.00 mi |
| Heat Index | 96°F (36°C) |
| Last update | 27 Jun 11:54 am CDT |
Extended Forecast for
Illiopolis IL
This Afternoon
High: 87 °F
Chance
T-stormsTonight
Low: 71 °F
Slight Chance
T-storms then
Mostly CloudySaturday
High: 90 °F
Mostly Sunny
Saturday Night
Low: 72 °F
Partly Cloudy
Sunday
High: 88 °F
Chance
T-storms then
Showers
LikelySunday Night
Low: 71 °F
Showers
LikelyMonday
High: 86 °F
Chance
T-storms then
Showers
LikelyMonday Night
Low: 66 °F
Partly Cloudy
Tuesday
High: 84 °F
Sunny
Detailed Forecast
This Afternoon
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 5pm. Mostly cloudy, with a high near 87. West southwest wind around 11 mph, with gusts as high as 21 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 71. West southwest wind 3 to 7 mph.
Saturday
Mostly sunny, with a high near 90. Calm wind becoming southwest around 5 mph.
Saturday Night
Partly cloudy, with a low around 72. South southwest wind 3 to 5 mph.
Sunday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. South southwest wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. South southwest wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 86. West southwest wind 6 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Partly cloudy, with a low around 66.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Mostly sunny, with a high near 85.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny, with a high near 87.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Illiopolis IL
39.85°N 89.26°W (Elev. 607 ft)
39.85°N 89.26°W (Elev. 607 ft)
11:56 am CDT Jun 27, 2025
12pm CDT Jun 27, 2025-6pm CDT Jul 3, 2025
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
