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 and Windy

73°F

23°C

Humidity 44%
Wind Speed SW 29 G 39 mph
Barometer 29.99 in (1015.4 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 21 Apr 1:54 pm CDT
Extended Forecast for

2 Miles ENE Harristown IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 77. Breezy, with a southwest wind around 22 mph, with gusts as high as 39 mph.

    High: 77 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 58. Southwest wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 58 °F

    Scattered
    T-storms

  • Wednesday

    Wednesday: Scattered showers and thunderstorms before 7am. Mostly sunny, with a high near 75. Southwest wind around 11 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

    High: 75 °F

    Scattered
    T-storms then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind around 8 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 80 °F

    Sunny then
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind 15 to 17 mph, with gusts as high as 25 mph.

    Low: 62 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 75. South wind around 15 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 77. Breezy, with a southwest wind around 22 mph, with gusts as high as 39 mph.
Tonight
Scattered showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 58. Southwest wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Wednesday
Scattered showers and thunderstorms before 7am. Mostly sunny, with a high near 75. Southwest wind around 11 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
Wednesday Night
Mostly clear, with a low around 57. South wind around 8 mph.
Thursday
Sunny, with a high near 80. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind 15 to 17 mph, with gusts as high as 25 mph.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 75. South wind around 15 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 53.
Saturday
Mostly sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 75.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 56. Breezy.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. Breezy.
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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:
2:16 pm CDT Apr 21, 2026
Forecast Valid:
2pm CDT Apr 21, 2026-6pm CDT Apr 27, 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