Fire Weather Concerns and Severe Weather

Dry and breezy conditions will bring elevated to critical fire weather conditions across portions of the northern and central High Plains through this weekend, where fuels remain largely receptive. Severe thunderstorms and heavy rainfall are possible from the Plains into the Upper Midwest, as well as in the Ohio Valley and portions of the Mid-Atlantic through this weekend. Read More >

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

82°F

28°C

Humidity 65%
Wind Speed SW 7 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 12 Sep 10:54 am CDT
Extended Forecast for

Harristown IL

  • Today

    Today: Sunny, with a high near 88. West wind 6 to 8 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 64. Northwest wind around 5 mph becoming calm.

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 4pm.  Partly sunny, with a high near 82. North wind 5 to 11 mph, with gusts as high as 15 mph.  Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 1am.  Mostly cloudy, with a low around 57. Northeast wind 8 to 11 mph, with gusts as high as 16 mph.

    Low: 57 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 81. East wind around 14 mph, with gusts as high as 18 mph.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66. Southeast wind 13 to 15 mph, with gusts as high as 20 mph.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. South wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers after 1pm.  Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 88. West wind 6 to 8 mph.
Tonight
Partly cloudy, with a low around 64. Northwest wind around 5 mph becoming calm.
Sunday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 82. North wind 5 to 11 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Sunday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 57. Northeast wind 8 to 11 mph, with gusts as high as 16 mph.
Monday
Mostly sunny, with a high near 81. East wind around 14 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 66. Southeast wind 13 to 15 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 92. South wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.
Wednesday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 91.
Wednesday Night
A 50 percent chance of showers. Partly cloudy, with a low around 68.
Thursday
A chance of showers. Partly sunny, with a high near 85.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 62.
Friday
A chance of showers. Mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Harristown IL
 39.84°N 89.06°W (Elev. 699 ft)
7:36 am CDT Sep 12, 2026
11am CDT Sep 12, 2026-6pm CDT Sep 18, 2026
 
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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