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.

Light Rain and Breezy

62°F

17°C

Humidity 90%
Wind Speed S 21 G 28 mph
Barometer 29.83 in (1009.8 mb)
Dewpoint 59°F (15°C)
Visibility 7.00 mi
Last update 16 Apr 3:54 am CDT
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Showers likely, mainly before 5am. Cloudy, with a low around 62. South southwest wind around 13 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 62 °F

    Showers
    Likely

  • Thursday

    Thursday: A 10 percent chance of showers before 7am. Cloudy through mid morning, then gradual clearing, with a high near 79. West wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 79 °F

    Slight Chance
    Showers then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57. West wind 5 to 7 mph becoming light and variable.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 84. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 84 °F

    Mostly Sunny
    then Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 49. South wind around 16 mph becoming west southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 49 °F

    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 59. West northwest wind around 17 mph, with gusts as high as 28 mph.

    High: 59 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Patchy frost after 3am. Otherwise, mostly clear, with a low around 37. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 58.

    High: 58 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers likely, mainly before 5am. Cloudy, with a low around 62. South southwest wind around 13 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A 10 percent chance of showers before 7am. Cloudy through mid morning, then gradual clearing, with a high near 79. West wind 11 to 14 mph, with gusts as high as 24 mph.
Thursday Night
Mostly clear, with a low around 57. West wind 5 to 7 mph becoming light and variable.
Friday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 84. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
Showers and possibly a thunderstorm. Low around 49. South wind around 16 mph becoming west southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Saturday
A 40 percent chance of showers before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 59. West northwest wind around 17 mph, with gusts as high as 28 mph.
Saturday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 37. West northwest wind 9 to 14 mph, with gusts as high as 22 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 38.
Monday
Sunny, with a high near 65.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Mostly sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
4:31 am CDT Apr 16, 2026
Forecast Valid:
4am CDT Apr 16, 2026-6pm CDT Apr 22, 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