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

58°F

14°C

Humidity 93%
Wind Speed S 9 mph
Barometer 29.92 in (1012.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 17 Apr 4:54 am CDT
Extended Forecast for

2 Miles ENE Harristown IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. Breezy, with a south wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 32 mph.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms and
    Breezy

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11pm. Low around 46. Breezy, with a south wind 18 to 20 mph becoming west northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 46 °F

    T-storms and
    Breezy

  • Saturday

    Saturday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 4pm. Cloudy through mid morning, then gradual clearing, with a high near 55. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.

    High: 55 °F

    Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 8 to 16 mph, with gusts as high as 24 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 8 to 17 mph, with gusts as high as 26 mph.

    High: 59 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. North northwest wind 6 to 10 mph becoming east after midnight. Winds could gust as high as 17 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Monday

    Monday: Patchy frost before 8am. Otherwise, sunny, with a high near 64. East wind 6 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph.

    High: 64 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76. Breezy.

    High: 76 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. Breezy, with a south wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 32 mph.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11pm. Low around 46. Breezy, with a south wind 18 to 20 mph becoming west northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 4pm. Cloudy through mid morning, then gradual clearing, with a high near 55. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Saturday Night
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 8 to 16 mph, with gusts as high as 24 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 8 to 17 mph, with gusts as high as 26 mph.
Sunday Night
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. North northwest wind 6 to 10 mph becoming east after midnight. Winds could gust as high as 17 mph.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 64. East wind 6 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Mostly sunny, with a high near 76. Breezy.
Tuesday Night
Mostly clear, with a low around 55.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Mostly sunny, with a high near 80.
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:
5:16 am CDT Apr 17, 2026
Forecast Valid:
5am CDT Apr 17, 2026-6pm CDT Apr 23, 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