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.

Mostly Cloudy and Breezy

80°F

27°C

Humidity 49%
Wind Speed S 24 G 41 mph
Barometer 29.86 in (1010.7 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 30 Mar 3:54 pm CDT
Extended Forecast for

2 Miles ENE Harristown IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 62. Breezy, with a south southwest wind 16 to 20 mph, with gusts as high as 29 mph.

    Low: 62 °F

    Partly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 81. Breezy, with a southwest wind 18 to 26 mph, with gusts as high as 36 mph.

    High: 81 °F

    Chance
    T-storms and
    Breezy

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms, mainly between 7pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 50. Southwest wind around 14 mph becoming northeast after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 50 °F

    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 62. East northeast wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 62 °F

    Showers

  • Wednesday Night

    Wednesday Night: Rain. Low around 56. South wind 14 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 56 °F

    Rain

  • Thursday

    Thursday: Rain likely, then rain and possibly a thunderstorm after 10am. High near 75. Breezy, with a south wind 17 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 75 °F

    Breezy. Rain
    Likely then
    Rain

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 1am, then rain likely. Low around 55. Breezy, with a south wind 16 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 55 °F

    Rain and
    Breezy

  • Friday

    Friday: A 50 percent chance of rain. Mostly cloudy, with a high near 75.

    High: 75 °F

    Chance Rain

  • Friday Night

    Friday Night: Rain likely, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 70%.

    Low: 57 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 62. Breezy, with a south southwest wind 16 to 20 mph, with gusts as high as 29 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 81. Breezy, with a southwest wind 18 to 26 mph, with gusts as high as 36 mph.
Tuesday Night
Showers and thunderstorms, mainly between 7pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 50. Southwest wind around 14 mph becoming northeast after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers and possibly a thunderstorm. High near 62. East northeast wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Rain. Low around 56. South wind 14 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Rain likely, then rain and possibly a thunderstorm after 10am. High near 75. Breezy, with a south wind 17 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
Rain and possibly a thunderstorm before 1am, then rain likely. Low around 55. Breezy, with a south wind 16 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A 50 percent chance of rain. Mostly cloudy, with a high near 75.
Friday Night
Rain likely, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 70%.
Saturday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 68. Breezy. Chance of precipitation is 70%.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 38.
Sunday
Partly sunny, with a high near 54. Breezy.
Sunday Night
Mostly clear, with a low around 35.
Monday
Sunny, with a high near 59.
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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:
1:26 pm CDT Mar 30, 2026
Forecast Valid:
4pm CDT Mar 30, 2026-6pm CDT Apr 6, 2026
 
Forecast Discussion
 
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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