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

61°F

16°C

Humidity 78%
Wind Speed NE 6 mph
Barometer 30.04 in (1017.0 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 3 Apr 9:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 76. South wind 5 to 13 mph, with gusts as high as 21 mph.

    High: 76 °F

    Partly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 59. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 59 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers, mainly before 10am. Temperature falling to around 53 by 5pm. West wind 14 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 64 °F⇓

    Showers then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 37. West northwest wind 10 to 15 mph, with gusts as high as 28 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 53. West northwest wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 53 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. West wind 6 to 9 mph, with gusts as high as 15 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55. Northwest wind 9 to 15 mph, with gusts as high as 23 mph.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 76. South wind 5 to 13 mph, with gusts as high as 21 mph.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 59. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers, mainly before 10am. Temperature falling to around 53 by 5pm. West wind 14 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 37. West northwest wind 10 to 15 mph, with gusts as high as 28 mph.
Sunday
Mostly sunny, with a high near 53. West northwest wind 10 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 37. West wind 6 to 9 mph, with gusts as high as 15 mph.
Monday
Sunny, with a high near 55. Northwest wind 9 to 15 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 73.
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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:
9:36 am CDT Apr 3, 2026
Forecast Valid:
10am CDT Apr 3, 2026-6pm CDT Apr 9, 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