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

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

31°F

-1°C

Humidity 92%
Wind Speed E 15 mph
Barometer 30.33 in (1027.7 mb)
Dewpoint 29°F (-2°C)
Visibility 8.00 mi
Wind Chill20°F (-7°C)
Last update 2 Mar 4:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Overnight

    Overnight: A chance of snow before 5am, then a slight chance of freezing rain. Cloudy, with a low around 30. East wind around 11 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.

    Low: 30 °F

    Chance Wintry
    Mix

  • Monday

    Monday: Cloudy, with a high near 42. East wind 9 to 13 mph, with gusts as high as 18 mph.

    High: 42 °F

    Cloudy

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm, mainly after 3am. Cloudy, with a low around 37. East wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 37 °F

    Cloudy then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers. High near 52. Southeast wind around 7 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 52 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers before midnight, then showers and possibly a thunderstorm between midnight and 3am, then showers after 3am. Low around 46. East northeast wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 46 °F

    Showers

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after noon. High near 62. Southeast wind 8 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 62 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 51. South southwest wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 51 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly before noon. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.

    High: 64 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 50 percent chance of showers. Partly cloudy, with a low around 51.

    Low: 51 °F

    Chance
    Showers

Detailed Forecast

Overnight
A chance of snow before 5am, then a slight chance of freezing rain. Cloudy, with a low around 30. East wind around 11 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.
Monday
Cloudy, with a high near 42. East wind 9 to 13 mph, with gusts as high as 18 mph.
Monday Night
Showers likely and possibly a thunderstorm, mainly after 3am. Cloudy, with a low around 37. East wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers. High near 52. Southeast wind around 7 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
Showers before midnight, then showers and possibly a thunderstorm between midnight and 3am, then showers after 3am. Low around 46. East northeast wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
Showers likely, then showers and possibly a thunderstorm after noon. High near 62. Southeast wind 8 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm. Low around 51. South southwest wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
Showers likely, mainly before noon. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.
Thursday Night
A 50 percent chance of showers. Partly cloudy, with a low around 51.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. Chance of precipitation is 70%.
Friday Night
Showers and possibly a thunderstorm. Mostly cloudy, with a low around 54.
Saturday
A chance of showers. Cloudy, with a high near 64.
Saturday Night
Mostly cloudy, with a low around 42.
Sunday
Partly sunny, with a high near 62.
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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:
3:31 am CST Mar 2, 2026
Forecast Valid:
4am CST Mar 2, 2026-6pm CDT Mar 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation