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

46°F

8°C

Humidity 86%
Wind Speed W 14 G 22 mph
Barometer 29.96 in (1014.7 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 7 Mar 4:54 pm CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. West northwest wind 6 to 14 mph, with gusts as high as 22 mph.

    Low: 35 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 63. Southwest wind 8 to 16 mph, with gusts as high as 23 mph.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 44. South southwest wind 11 to 14 mph, with gusts as high as 22 mph.

    Low: 44 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73. South southwest wind 11 to 18 mph, with gusts as high as 25 mph.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 29 mph.

    High: 78 °F

    Mostly Sunny
    then Chance
    T-storms and
    Breezy

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 50. Breezy, with a south southwest wind 18 to 23 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: Showers. High near 63. Breezy. Chance of precipitation is 90%.

    High: 63 °F

    Breezy.
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. Blustery.

    Low: 29 °F

    Partly Cloudy
    and Blustery

Detailed Forecast

Tonight
Mostly cloudy, with a low around 35. West northwest wind 6 to 14 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 63. Southwest wind 8 to 16 mph, with gusts as high as 23 mph.
Sunday Night
Clear, with a low around 44. South southwest wind 11 to 14 mph, with gusts as high as 22 mph.
Monday
Sunny, with a high near 73. South southwest wind 11 to 18 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 58. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 29 mph.
Tuesday Night
Showers and possibly a thunderstorm. Low around 50. Breezy, with a south southwest wind 18 to 23 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
Showers. High near 63. Breezy. Chance of precipitation is 90%.
Wednesday Night
Partly cloudy, with a low around 29. Blustery.
Thursday
Mostly sunny, with a high near 48.
Thursday Night
Mostly cloudy, with a low around 40. Breezy.
Friday
Mostly cloudy, with a high near 62. Breezy.
Friday Night
Mostly cloudy, with a low around 34.
Saturday
Mostly cloudy, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
5:26 pm CST Mar 7, 2026
Forecast Valid:
5pm CST Mar 7, 2026-6pm CDT Mar 14, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation