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

69°F

21°C

Humidity 68%
Wind Speed E 5 mph
Barometer 30.22 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 11 Apr 7:15 pm CDT
Extended Forecast for

Harrisburg IL

  • Tonight

    Tonight: Partly cloudy, with a low around 60. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 60 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 83. South southwest wind 6 to 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    Low: 67 °F

    Mostly Cloudy
    then Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm. Partly sunny, with a high near 82. South southwest wind 15 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. South southwest wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 69. South southwest wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 69 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 23 mph.

    High: 85 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. South southwest wind 6 to 9 mph.

    Low: 65 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 60. Calm wind becoming south southeast around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 83. South southwest wind 6 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Monday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm. Partly sunny, with a high near 82. South southwest wind 15 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Monday Night
Partly cloudy, with a low around 68. South southwest wind 11 to 14 mph, with gusts as high as 23 mph.
Tuesday
Mostly sunny, with a high near 86. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 69. South southwest wind 11 to 13 mph, with gusts as high as 21 mph.
Wednesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 23 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. South southwest wind 6 to 9 mph.
Thursday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 62. South southwest wind 3 to 6 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. South southwest wind 5 to 10 mph, with gusts as high as 18 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. South wind 7 to 9 mph.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. West northwest wind 10 to 13 mph, with gusts as high as 21 mph.
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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:
5:41 pm CDT Apr 11, 2026
Forecast Valid:
7pm CDT Apr 11, 2026-6pm CDT Apr 18, 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