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

57°F

14°C

Humidity 75%
Wind Speed E 3 mph
Barometer 30.02 in
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 14 May 8:55 pm CDT
Extended Forecast for

Harrisburg IL

  • Tonight

    Tonight: Partly cloudy, with a low around 51. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 51 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 82. South wind 7 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 67. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 67 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms. Cloudy through mid morning, then becoming mostly sunny, with a high near 87. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66. South wind 6 to 8 mph.

    Low: 66 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 90. South wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 90 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 70. South wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 70 °F

    Clear

  • Monday

    Monday: Mostly sunny, with a high near 91. South wind 10 to 16 mph, with gusts as high as 23 mph.

    High: 91 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 74. South wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 74 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 51. Calm wind becoming south southeast around 5 mph after midnight.
Friday
A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 82. South wind 7 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Friday Night
A 30 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 67. South wind 8 to 10 mph, with gusts as high as 21 mph.
Saturday
A 30 percent chance of showers and thunderstorms. Cloudy through mid morning, then becoming mostly sunny, with a high near 87. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66. South wind 6 to 8 mph.
Sunday
Sunny, with a high near 90. South wind 6 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Clear, with a low around 70. South wind 8 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 91. South wind 10 to 16 mph, with gusts as high as 23 mph.
Monday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 74. South wind 11 to 14 mph, with gusts as high as 23 mph.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. South southwest wind 13 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 67. South wind 5 to 9 mph, with gusts as high as 18 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 83. South wind 5 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. North northeast wind around 5 mph becoming calm in the evening.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 81. Light and variable wind becoming south 5 to 7 mph in the morning.
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ABOUT THIS FORECAST

 
Point Forecast:
Harrisburg IL
 37.72°N 88.55°W
Last Update:
9:01 pm CDT May 14, 2026
Forecast Valid:
9pm CDT May 14, 2026-6pm CDT May 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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