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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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
9:57 pm CDT Apr 17, 2026
10pm CDT Apr 17, 2026-6pm CDT Apr 24, 2026
 
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Additional Resources

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