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.

Fog

57°F

14°C

Humidity 96%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 56°F (13°C)
Visibility 0.25 mi
Last update 5 Mar 11:35 pm CST
Extended Forecast for

Harrisburg IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 3am and 4am. Patchy fog between midnight and 5am. Otherwise, partly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Chance
    Showers and
    Patchy Fog

  • Friday

    Friday: Mostly sunny, with a high near 80. South southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers between midnight and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 63. South wind 8 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. High near 72. South southwest wind 8 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%.

    High: 72 °F

    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 43. Northwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 43 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 65. Light and variable wind.

    High: 65 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 49. Calm wind becoming south southwest around 5 mph after midnight.

    Low: 49 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers after noon. Mostly sunny, with a high near 75. South southwest wind 5 to 11 mph, with gusts as high as 20 mph.

    High: 75 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, mainly after midnight. Partly cloudy, with a low around 61. South southwest wind around 8 mph.

    Low: 61 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly between 3am and 4am. Patchy fog between midnight and 5am. Otherwise, partly cloudy, with a low around 59. Calm wind.
Friday
Mostly sunny, with a high near 80. South southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
A chance of showers between midnight and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 63. South wind 8 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Saturday
Showers and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. High near 72. South southwest wind 8 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%.
Saturday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 43. Northwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 65. Light and variable wind.
Sunday Night
Mostly clear, with a low around 49. Calm wind becoming south southwest around 5 mph after midnight.
Monday
A slight chance of showers after noon. Mostly sunny, with a high near 75. South southwest wind 5 to 11 mph, with gusts as high as 20 mph.
Monday Night
A chance of showers and thunderstorms, mainly after midnight. Partly cloudy, with a low around 61. South southwest wind around 8 mph.
Tuesday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 77. South southwest wind 8 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 61. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Wednesday
Showers. Mostly cloudy, with a high near 70. South southwest wind 13 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 40. North northwest wind 7 to 11 mph, with gusts as high as 18 mph.
Thursday
Mostly sunny, with a high near 55. North wind 6 to 9 mph becoming east 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 CST Mar 5, 2026
Forecast Valid:
11pm CST Mar 5, 2026-6pm CDT Mar 12, 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