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.

Overcast

65°F

18°C

Humidity 85%
Wind Speed NE 3 mph
Barometer 30.05 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 21 May 11:15 pm CDT
Extended Forecast for

Harrisburg IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. East northeast wind around 6 mph.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after 10am. Cloudy, with a high near 73. East northeast wind around 6 mph. Chance of precipitation is 70%.

    High: 73 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 3am, then a chance of showers. Mostly cloudy, with a low around 61. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 61 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 81. Light west northwest wind.

    High: 81 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Calm wind. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.

    Low: 64 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Memorial Day

    Memorial Day: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Calm wind becoming east around 5 mph in the afternoon.

    High: 80 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Light east wind.

    Low: 66 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 59. East northeast wind around 6 mph.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 10am. Cloudy, with a high near 73. East northeast wind around 6 mph. Chance of precipitation is 70%.
Friday Night
Showers and thunderstorms likely before 3am, then a chance of showers. Mostly cloudy, with a low around 61. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
A 20 percent chance of showers before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 81. Light west northwest wind.
Saturday Night
Partly cloudy, with a low around 62. Calm wind.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Calm wind. Chance of precipitation is 50%.
Sunday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.
Memorial Day
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Light east wind.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Calm wind becoming east southeast 5 to 7 mph in the morning.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. East southeast wind around 5 mph becoming calm in the evening.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 84. South wind 3 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Light southeast wind.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Calm wind becoming south southeast 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:
10:21 pm CDT May 21, 2026
Forecast Valid:
11pm CDT May 21, 2026-6pm CDT May 28, 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