National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

71°F

22°C

Humidity 73%
Wind Speed SW 20 mph
Barometer 29.86 in (1010.5 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 14 Apr 2:54 am CDT
Extended Forecast for

2 Miles ENE Harristown IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 66. South southwest wind around 17 mph, with gusts as high as 29 mph.

    Low: 66 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South southwest wind 16 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. South southwest wind 14 to 18 mph, with gusts as high as 30 mph.

    Low: 67 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 79. South southwest wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 79 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 61. Southwest wind 11 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 61 °F

    Showers

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 4pm. Partly sunny, with a high near 76. Southwest wind 11 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of thunderstorms before 7pm. Mostly clear, with a low around 56. South wind 6 to 9 mph. Chance of precipitation is 30%.

    Low: 56 °F

    Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 58. Chance of precipitation is 80%.

    Low: 58 °F

    Chance
    T-storms then
    Showers

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 66. South southwest wind around 17 mph, with gusts as high as 29 mph.
Tuesday
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South southwest wind 16 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. South southwest wind 14 to 18 mph, with gusts as high as 30 mph.
Wednesday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 79. South southwest wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm. Low around 61. Southwest wind 11 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
Showers likely, with thunderstorms also possible after 4pm. Partly sunny, with a high near 76. Southwest wind 11 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of thunderstorms before 7pm. Mostly clear, with a low around 56. South wind 6 to 9 mph. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 82.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 58. Chance of precipitation is 80%.
Saturday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 69. Breezy. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 39.
Sunday
Sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 38.
Monday
Sunny, with a high near 63.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
1:35 am CDT Apr 14, 2026
Forecast Valid:
3am CDT Apr 14, 2026-6pm CDT Apr 20, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation