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.

Mostly Cloudy

78°F

26°C

Humidity 43%
Wind Speed NW 12 mph
Barometer 30.02 in (1016.0 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 19 Jun 2:54 pm CDT
Extended Forecast for

2 Miles E Harristown IL

  • Tonight

    Tonight: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 61. West northwest wind 5 to 7 mph becoming calm.

    Low: 61 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 81. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 81 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A slight chance of showers between 4am and 5am, then a chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 61. Calm wind becoming east southeast around 6 mph after midnight. Chance of precipitation is 30%.

    Low: 61 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers before 7am, then showers and possibly a thunderstorm between 7am and 1pm, then showers and thunderstorms after 1pm. High near 76. East southeast wind 9 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 76 °F

    Showers then
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 61. South wind 13 to 17 mph becoming north after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 61 °F

    T-storms

  • Monday

    Monday: Partly sunny, with a high near 74. North wind around 14 mph, with gusts as high as 21 mph.

    High: 74 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 55. Northeast wind 5 to 10 mph, with gusts as high as 16 mph.

    Low: 55 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 61. West northwest wind 5 to 7 mph becoming calm.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 81. Calm wind becoming west northwest around 6 mph in the afternoon.
Saturday Night
A slight chance of showers between 4am and 5am, then a chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 61. Calm wind becoming east southeast around 6 mph after midnight. Chance of precipitation is 30%.
Sunday
A chance of showers before 7am, then showers and possibly a thunderstorm between 7am and 1pm, then showers and thunderstorms after 1pm. High near 76. East southeast wind 9 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 61. South wind 13 to 17 mph becoming north after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Monday
Partly sunny, with a high near 74. North wind around 14 mph, with gusts as high as 21 mph.
Monday Night
Partly cloudy, with a low around 55. Northeast wind 5 to 10 mph, with gusts as high as 16 mph.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
1:26 pm CDT Jun 19, 2026
Forecast Valid:
4pm CDT Jun 19, 2026-6pm CDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation