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

34°F

1°C

Humidity 67%
Wind Speed NA
Barometer 29.91 in (1013.3 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 5 Jan 2:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Overnight

    Overnight: Mostly clear, with a low around 31. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 50. Southwest wind around 10 mph, with gusts as high as 17 mph.

    High: 50 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. South wind 8 to 13 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 54. South southwest wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 54 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 33. West northwest wind 5 to 9 mph becoming light west after midnight.

    Low: 33 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 56. Light southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 56 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. South wind around 10 mph, with gusts as high as 18 mph.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Rain likely, mainly after noon. Mostly cloudy, with a high near 58. Chance of precipitation is 60%.

    High: 58 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain. Low around 48. Chance of precipitation is 80%.

    Low: 48 °F

    Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 31. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 50. Southwest wind around 10 mph, with gusts as high as 17 mph.
Monday Night
Mostly cloudy, with a low around 41. South wind 8 to 13 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 54. South southwest wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph.
Tuesday Night
Partly cloudy, with a low around 33. West northwest wind 5 to 9 mph becoming light west after midnight.
Wednesday
Sunny, with a high near 56. Light southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Wednesday Night
Partly cloudy, with a low around 43. South wind around 10 mph, with gusts as high as 18 mph.
Thursday
Rain likely, mainly after noon. Mostly cloudy, with a high near 58. Chance of precipitation is 60%.
Thursday Night
Rain. Low around 48. Chance of precipitation is 80%.
Friday
Rain likely, mainly after noon. Partly sunny, with a high near 58. Chance of precipitation is 60%.
Friday Night
A chance of rain. Mostly cloudy, with a low around 32.
Saturday
Partly sunny, with a high near 40. Breezy.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Mostly sunny, with a high near 33.
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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:
3:24 am CST Jan 5, 2026
Forecast Valid:
3am CST Jan 5, 2026-6pm CST Jan 11, 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