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.

Mostly Cloudy

75°F

24°C

Humidity 96%
Wind Speed NW 6 mph
Barometer 29.99 in (1014.8 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Last update 17 Aug 1:54 am CDT
Extended Forecast for

Taylorville IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 68. Northwest wind 3 to 5 mph.

    Low: 68 °F

    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 82. North northwest wind 7 to 10 mph, with gusts as high as 15 mph.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62. North wind around 6 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers likely after 1am. Increasing clouds, with a low around 68. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 68 °F

    Mostly Clear
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 82. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 82 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers. Partly cloudy, with a low around 64. Light northeast wind.

    Low: 64 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly before 3am. Mostly cloudy, with a low around 68. Northwest wind 3 to 5 mph.
Monday
Mostly sunny, with a high near 82. North northwest wind 7 to 10 mph, with gusts as high as 15 mph.
Monday Night
Mostly clear, with a low around 62. North wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 84. Calm wind becoming southwest around 6 mph in the afternoon.
Tuesday Night
Showers likely after 1am. Increasing clouds, with a low around 68. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 82. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 40 percent chance of showers. Partly cloudy, with a low around 64. Light northeast wind.
Thursday
Partly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 61.
Friday
Sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 62.
Saturday
Sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 62.
Sunday
Sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Taylorville IL
 39.5°N 89.25°W (Elev. 591 ft)
Last Update:
1:26 am CDT Aug 17, 2026
Forecast Valid:
2am CDT Aug 17, 2026-6pm CDT Aug 23, 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