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.

Thunderstorm Heavy Rain Fog/Mist

61°F

16°C

Humidity 93%
Wind Speed W 18 G 31 mph
Barometer 29.82 in (1009.4 mb)
Dewpoint 59°F (15°C)
Visibility 2.00 mi
Last update 17 Apr 9:54 pm CDT
Extended Forecast for

2 Miles ENE Harristown IL

Flood Watch until April 18, 04:00am
Tornado Watch April 17, 10:18pm until April 17, 11:00pm
Click here for hazard details and duration
Flood Watch
...
  •  
    Flood Watch until April 18, 04:00am
    Tornado Watch April 17, 10:18pm until April 17, 11:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 46 °F

    Severe
    Thunderstorms

  • Saturday

    Saturday: A 30 percent chance of showers, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 55. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 29 mph.

    High: 55 °F

    Breezy.
    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 36. Northwest wind 7 to 16 mph becoming west southwest after midnight. Winds could gust as high as 24 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 9am. Otherwise, sunny, with a high near 60. Southwest wind 7 to 12 mph becoming west 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 60 °F

    Patchy Frost
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 36. North northwest wind 6 to 11 mph becoming northeast after midnight. Winds could gust as high as 18 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Monday

    Monday: Patchy frost before 9am. Otherwise, sunny, with a high near 61. East wind 6 to 9 mph becoming south in the afternoon.

    High: 61 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49. South southeast wind 9 to 13 mph, with gusts as high as 21 mph.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Breezy.

    High: 77 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 46. Southwest wind around 18 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A 30 percent chance of showers, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 55. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 29 mph.
Saturday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 36. Northwest wind 7 to 16 mph becoming west southwest after midnight. Winds could gust as high as 24 mph.
Sunday
Patchy frost before 9am. Otherwise, sunny, with a high near 60. Southwest wind 7 to 12 mph becoming west 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.
Sunday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 36. North northwest wind 6 to 11 mph becoming northeast after midnight. Winds could gust as high as 18 mph.
Monday
Patchy frost before 9am. Otherwise, sunny, with a high near 61. East wind 6 to 9 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 49. South southeast wind 9 to 13 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 77. Breezy.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
A chance of showers. Partly cloudy, with a low around 62.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 76.
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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:
9:57 pm CDT Apr 17, 2026
Forecast Valid:
10pm CDT Apr 17, 2026-6pm CDT Apr 24, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation