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

84°F

29°C

Humidity 33%
Wind Speed Calm
Barometer 29.80 in
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 21 Mar 5:15 pm CDT
Extended Forecast for

Harrisburg IL

  • Tonight

    Tonight: Mostly clear, with a low around 64. Light south southwest wind increasing to 5 to 9 mph in the evening.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 84 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 40. West wind 10 to 17 mph becoming north in the evening. Winds could gust as high as 29 mph. Chance of precipitation is 30%.

    Low: 40 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 58. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. North northeast wind around 6 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 64. East southeast wind 3 to 5 mph.

    High: 64 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 73. South wind 3 to 8 mph.

    High: 73 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57. South southwest wind 6 to 8 mph.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 64. Light south southwest wind increasing to 5 to 9 mph in the evening.
Sunday
Mostly sunny, with a high near 84. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Sunday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 40. West wind 10 to 17 mph becoming north in the evening. Winds could gust as high as 29 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 58. North northeast wind around 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 41. North northeast wind around 6 mph.
Tuesday
Mostly sunny, with a high near 64. East southeast wind 3 to 5 mph.
Tuesday Night
Mostly cloudy, with a low around 46. Calm wind.
Wednesday
Partly sunny, with a high near 73. South wind 3 to 8 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57. South southwest wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 83. Southwest wind 9 to 15 mph, with gusts as high as 23 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 49. South southwest wind around 11 mph becoming north after midnight. Winds could gust as high as 21 mph.
Friday
A chance of showers. Partly sunny, with a high near 60. North northeast wind 11 to 13 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 39. North northeast wind 7 to 9 mph.
Saturday
A slight chance of showers. Partly sunny, with a high near 59. Northeast wind around 8 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Harrisburg IL
 37.74°N 88.58°W
Last Update:
3:01 pm CDT Mar 21, 2026
Forecast Valid:
5pm CDT Mar 21, 2026-6pm CDT Mar 28, 2026
 
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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