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.

Fair

27°F

-3°C

Humidity 85%
Wind Speed Calm
Barometer 30.29 in (1026.4 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 11 Feb 11:54 pm CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 30. Light and variable wind.

    Low: 30 °F

    Mostly Cloudy

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 48. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 48 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 29. South southeast wind around 6 mph.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 52. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 52 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 32. South wind around 6 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 52. South southeast wind 5 to 8 mph.

    High: 52 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 38. Southeast wind around 8 mph becoming northeast after midnight.

    Low: 38 °F

    Chance Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 55.

    High: 55 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 30. Light and variable wind.
Thursday
Cloudy, then gradually becoming mostly sunny, with a high near 48. Calm wind becoming south southwest around 6 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 29. South southeast wind around 6 mph.
Friday
Sunny, with a high near 52. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.
Friday Night
Increasing clouds, with a low around 32. South wind around 6 mph.
Saturday
Mostly cloudy, with a high near 52. South southeast wind 5 to 8 mph.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 38. Southeast wind around 8 mph becoming northeast after midnight.
Sunday
Mostly sunny, with a high near 55.
Sunday Night
Mostly clear, with a low around 33.
Washington's Birthday
Partly sunny, with a high near 57.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly cloudy, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
A chance of rain. Mostly sunny, with a high near 64. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
12:36 am CST Feb 12, 2026
Forecast Valid:
12am CST Feb 12, 2026-6pm CST Feb 18, 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