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

74°F

23°C

Humidity 82%
Wind Speed N 5 mph
Barometer 29.96 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 29 Jul 9:55 am CDT
Extended Forecast for

Harrisburg IL

  • Today

    Today: Sunny, with a high near 86. North northeast wind around 7 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 65. North northeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 87. Calm wind becoming east around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 88. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 20%.

    High: 88 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 69. South southeast wind around 6 mph. Chance of precipitation is 80%.

    Low: 69 °F

    Showers

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. Southwest wind 6 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 66. Northwest wind 6 to 10 mph.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 83. North wind 7 to 10 mph.

    High: 83 °F

    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 86. North northeast wind around 7 mph.
Tonight
Clear, with a low around 65. North northeast wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 87. Calm wind becoming east around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 66. Calm wind.
Friday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 88. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
Showers and possibly a thunderstorm. Low around 69. South southeast wind around 6 mph. Chance of precipitation is 80%.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. Southwest wind 6 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Saturday Night
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 66. Northwest wind 6 to 10 mph.
Sunday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 83. North wind 7 to 10 mph.
Sunday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66. North northeast wind 5 to 7 mph becoming calm in the evening.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Calm wind becoming east northeast around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 67. Calm wind.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind becoming east northeast around 5 mph in the afternoon.
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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:
9:51 am CDT Jul 29, 2026
Forecast Valid:
10am CDT Jul 29, 2026-6pm CDT Aug 4, 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