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

71°F

22°C

Humidity 69%
Wind Speed S 8 mph
Barometer 29.96 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 17 May 11:15 pm CDT
Extended Forecast for

Harrisburg IL

  • Overnight

    Overnight: Partly cloudy, with a low around 70. South wind around 9 mph, with gusts as high as 18 mph.

    Low: 70 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 88. South southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 88 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 72. South wind 9 to 11 mph, with gusts as high as 22 mph.

    Low: 72 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 88. South southwest wind 13 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    High: 88 °F

    Slight Chance
    T-storms then
    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 63. Southwest wind 5 to 8 mph becoming light and variable. Chance of precipitation is 90%.

    Low: 63 °F

    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 74. North wind around 8 mph. Chance of precipitation is 40%.

    High: 74 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 55. North northeast wind 6 to 8 mph.

    Low: 55 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Northeast wind around 7 mph.

    High: 75 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers after 1am. Mostly cloudy, with a low around 58. East wind around 6 mph becoming calm after midnight.

    Low: 58 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 70. South wind around 9 mph, with gusts as high as 18 mph.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 88. South southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Monday Night
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 72. South wind 9 to 11 mph, with gusts as high as 22 mph.
Tuesday
A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 88. South southwest wind 13 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 63. Southwest wind 5 to 8 mph becoming light and variable. Chance of precipitation is 90%.
Wednesday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 74. North wind around 8 mph. Chance of precipitation is 40%.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 55. North northeast wind 6 to 8 mph.
Thursday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Northeast wind around 7 mph.
Thursday Night
A chance of showers after 1am. Mostly cloudy, with a low around 58. East wind around 6 mph becoming calm after midnight.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Light and variable wind becoming south around 5 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. South wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the afternoon.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Light south southwest wind.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Calm wind becoming south around 6 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:
9:11 pm CDT May 17, 2026
Forecast Valid:
12am CDT May 18, 2026-6pm CDT May 24, 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