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

Harrisburg-Raleigh Airport (KHSB)

Lat: 37.81°NLon: 88.54°WElev: 387ft.

Fair

59°F

15°C

Humidity 46%
Wind Speed Calm
Barometer 30.19 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 19 Apr 7:35 pm CDT
Extended Forecast for

Harrisburg IL

  • Tonight

    Tonight: Mostly clear, with a low around 42. Light and variable wind.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 68. Light and variable wind.

    High: 68 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49. Calm wind becoming south around 6 mph after midnight.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Southwest wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 55. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 55 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80. Southwest wind 6 to 9 mph, with gusts as high as 18 mph.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind around 6 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 82. South wind 7 to 17 mph, with gusts as high as 25 mph.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. South wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 63 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 42. Light and variable wind.
Monday
Sunny, with a high near 68. Light and variable wind.
Monday Night
Mostly clear, with a low around 49. Calm wind becoming south around 6 mph after midnight.
Tuesday
Mostly sunny, with a high near 77. Southwest wind 6 to 14 mph, with gusts as high as 24 mph.
Tuesday Night
Clear, with a low around 55. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday
Sunny, with a high near 80. Southwest wind 6 to 9 mph, with gusts as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind around 6 mph.
Thursday
Sunny, with a high near 82. South wind 7 to 17 mph, with gusts as high as 25 mph.
Thursday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. South wind 10 to 13 mph, with gusts as high as 22 mph.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. South southwest wind 13 to 15 mph, with gusts as high as 24 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. West southwest wind around 7 mph becoming northwest after midnight.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 74. Northwest wind 7 to 9 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 54. North northeast wind around 6 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 73. East wind 6 to 8 mph becoming northwest in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Harrisburg IL
 37.74°N 88.55°W
Last Update:
3:07 pm CDT Apr 19, 2026
Forecast Valid:
7pm CDT Apr 19, 2026-6pm CDT Apr 26, 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