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.

Fair

37°F

3°C

Humidity 93%
Wind Speed E 6 mph
Barometer 30.15 in (1021.6 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 9 Jan 8:54 pm CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Tonight

    Tonight: A 30 percent chance of rain after 3am. Mostly cloudy, with a low around 36. East wind around 5 mph becoming calm.

    Low: 36 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: Rain and snow likely before 10am, then a chance of rain between 10am and 5pm, then a slight chance of snow showers after 5pm. Cloudy through mid morning, then gradual clearing, with a high near 42. West northwest wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    High: 42 °F

    Rain/Snow
    Likely then
    Slight Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: A 20 percent chance of snow showers before midnight. Partly cloudy, with a low around 22. Blustery, with a west northwest wind 14 to 22 mph, with gusts as high as 30 mph.

    Low: 22 °F

    Slight Chance
    Snow Showers
    then Partly
    Cloudy and
    Blustery

  • Sunday

    Sunday: Mostly sunny, with a high near 34. Breezy, with a west northwest wind 17 to 22 mph decreasing to 9 to 14 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 34 °F

    Mostly Sunny
    and Breezy
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 24. South southwest wind 6 to 11 mph, with gusts as high as 20 mph.

    Low: 24 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 45. West southwest wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 45 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 33. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    Low: 33 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of rain after 3am. Mostly cloudy, with a low around 36. East wind around 5 mph becoming calm.
Saturday
Rain and snow likely before 10am, then a chance of rain between 10am and 5pm, then a slight chance of snow showers after 5pm. Cloudy through mid morning, then gradual clearing, with a high near 42. West northwest wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Saturday Night
A 20 percent chance of snow showers before midnight. Partly cloudy, with a low around 22. Blustery, with a west northwest wind 14 to 22 mph, with gusts as high as 30 mph.
Sunday
Mostly sunny, with a high near 34. Breezy, with a west northwest wind 17 to 22 mph decreasing to 9 to 14 mph in the afternoon. Winds could gust as high as 30 mph.
Sunday Night
Mostly clear, with a low around 24. South southwest wind 6 to 11 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 45. West southwest wind 10 to 14 mph, with gusts as high as 22 mph.
Monday Night
Partly cloudy, with a low around 33. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Tuesday
Partly sunny, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
A chance of rain and snow after noon. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.
Wednesday Night
Mostly cloudy, with a low around 18.
Thursday
Partly sunny, with a high near 31.
Thursday Night
Mostly cloudy, with a low around 22.
Friday
Mostly cloudy, with a high near 37.
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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:
8:38 pm CST Jan 9, 2026
Forecast Valid:
9pm CST Jan 9, 2026-6pm CST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation