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

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

40°F

4°C

Humidity 86%
Wind Speed E 10 mph
Barometer 30.22 in (1024.0 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 2 Mar 4:54 pm CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Tonight

    Tonight: A 50 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 35. East wind around 7 mph.

    Low: 35 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 3pm. High near 50. East southeast wind around 6 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 50 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Patchy fog. Low around 43. East northeast wind 6 to 9 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 43 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: Showers, with thunderstorms also possible after 3pm. Patchy fog before 7am. High near 59. East wind 6 to 9 mph becoming south southeast in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 59 °F

    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 52. South wind 6 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 52 °F

    Showers

  • Thursday

    Thursday: Showers, mainly before noon. High near 65. West southwest wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 65 °F

    Showers then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers after midnight. Mostly cloudy, with a low around 50. West southwest wind 6 to 9 mph becoming south southeast after midnight. Winds could gust as high as 15 mph.

    Low: 50 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely, mainly before noon. Mostly cloudy, with a high near 75. Breezy. Chance of precipitation is 60%.

    High: 75 °F

    Showers
    Likely and
    Breezy

  • Friday Night

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

    Low: 58 °F

    Chance
    T-storms then
    Showers

Detailed Forecast

Tonight
A 50 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 35. East wind around 7 mph.
Tuesday
Showers, with thunderstorms also possible after 3pm. High near 50. East southeast wind around 6 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm. Patchy fog. Low around 43. East northeast wind 6 to 9 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
Showers, with thunderstorms also possible after 3pm. Patchy fog before 7am. High near 59. East wind 6 to 9 mph becoming south southeast in the afternoon. 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 52. South wind 6 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Showers, mainly before noon. High near 65. West southwest wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
A 40 percent chance of showers after midnight. Mostly cloudy, with a low around 50. West southwest wind 6 to 9 mph becoming south southeast after midnight. Winds could gust as high as 15 mph.
Friday
Showers likely, mainly before noon. Mostly cloudy, with a high near 75. Breezy. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 58. Chance of precipitation is 80%.
Saturday
Showers likely, mainly before noon. Cloudy, with a high near 67. Chance of precipitation is 70%.
Saturday Night
Mostly cloudy, with a low around 45.
Sunday
Partly sunny, with a high near 62.
Sunday Night
Mostly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 68.
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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:
4:41 pm CST Mar 2, 2026
Forecast Valid:
5pm CST Mar 2, 2026-6pm CDT Mar 9, 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