National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Partly Cloudy

62°F

17°C

Humidity 84%
Wind Speed SW 17 mph
Barometer 29.79 in (1008.4 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 15 Nov 1:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. South southwest wind around 13 mph, with gusts as high as 21 mph.

    Low: 59 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy through mid morning, then gradual clearing, with a high near 75. Southwest wind 11 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.

    High: 75 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 38. North northwest wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 38 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 54. Northwest wind 7 to 10 mph, with gusts as high as 15 mph.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 31. Northwest wind around 6 mph becoming calm in the evening.

    Low: 31 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 55. Calm wind becoming southeast 5 to 8 mph in the morning.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Rain. Low around 42. East southeast wind 9 to 13 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 42 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before noon. Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance Rain
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. South southwest wind around 13 mph, with gusts as high as 21 mph.
Saturday
Mostly cloudy through mid morning, then gradual clearing, with a high near 75. Southwest wind 11 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.
Saturday Night
Clear, with a low around 38. North northwest wind 8 to 13 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 54. Northwest wind 7 to 10 mph, with gusts as high as 15 mph.
Sunday Night
Mostly clear, with a low around 31. Northwest wind around 6 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 55. Calm wind becoming southeast 5 to 8 mph in the morning.
Monday Night
Rain. Low around 42. East southeast wind 9 to 13 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
A 30 percent chance of rain before noon. Mostly cloudy, with a high near 55.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Partly sunny, with a high near 56.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 44.
Thursday
Rain. Mostly cloudy, with a high near 59.
Thursday Night
Rain likely. Mostly cloudy, with a low around 47.
Friday
A chance of rain. Mostly cloudy, with a high near 61.
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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:
12:55 am CST Nov 15, 2025
Forecast Valid:
2am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
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