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.

Fair

77°F

25°C

Humidity 66%
Wind Speed S 16 G 22 mph
Barometer 29.90 in (1012.0 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 17 Apr 11:54 am CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 83. Breezy, with a south wind 15 to 20 mph, with gusts as high as 31 mph.

    High: 83 °F

    Slight Chance
    T-storms and
    Breezy

  • Tonight

    Tonight: Showers and thunderstorms. Low around 46. South wind 15 to 17 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.

    Low: 46 °F

    Showers

  • Saturday

    Saturday: A 30 percent chance of showers, mainly before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 55. Northwest wind around 18 mph, with gusts as high as 28 mph.

    High: 55 °F

    Chance
    Showers then
    Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 7 to 14 mph, with gusts as high as 23 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 7 to 15 mph, with gusts as high as 25 mph.

    High: 59 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. North northwest wind 5 to 10 mph becoming east after midnight. Winds could gust as high as 16 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Monday

    Monday: Patchy frost before 8am. Otherwise, sunny, with a high near 64. East wind 6 to 8 mph becoming south in the afternoon.

    High: 64 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 83. Breezy, with a south wind 15 to 20 mph, with gusts as high as 31 mph.
Tonight
Showers and thunderstorms. Low around 46. South wind 15 to 17 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 8am. Mostly cloudy, then gradually becoming sunny, with a high near 55. Northwest wind around 18 mph, with gusts as high as 28 mph.
Saturday Night
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 7 to 14 mph, with gusts as high as 23 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 7 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Patchy frost after 5am. Otherwise, mostly clear, with a low around 36. North northwest wind 5 to 10 mph becoming east after midnight. Winds could gust as high as 16 mph.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 64. East wind 6 to 8 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 55.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
11:16 am CDT Apr 17, 2026
Forecast Valid:
12pm CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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