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

49°F

9°C

Humidity 93%
Wind Speed SE 3 mph
Barometer 29.71 in
Dewpoint 47°F (8°C)
Visibility 7.00 mi
Last update 18 Feb 8:35 pm CST
Extended Forecast for

Harrisburg IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. South southwest wind around 7 mph, with gusts as high as 18 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 70. South southwest wind 6 to 16 mph, with gusts as high as 32 mph. Chance of precipitation is 70%.

    High: 70 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 43. West wind 10 to 14 mph, with gusts as high as 25 mph.

    Low: 43 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 56. West wind 5 to 13 mph, with gusts as high as 21 mph.

    High: 56 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33. Calm wind becoming north around 5 mph after midnight.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 48. North wind 5 to 8 mph.

    High: 48 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 25. Northwest wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 25 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 41. Northwest wind 10 to 15 mph, with gusts as high as 23 mph.

    High: 41 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 21. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 21 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 54. South southwest wind around 7 mph, with gusts as high as 18 mph.
Thursday
A chance of showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 70. South southwest wind 6 to 16 mph, with gusts as high as 32 mph. Chance of precipitation is 70%.
Thursday Night
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 43. West wind 10 to 14 mph, with gusts as high as 25 mph.
Friday
Sunny, with a high near 56. West wind 5 to 13 mph, with gusts as high as 21 mph.
Friday Night
Mostly cloudy, with a low around 33. Calm wind becoming north around 5 mph after midnight.
Saturday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 48. North wind 5 to 8 mph.
Saturday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 25. Northwest wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday
Mostly sunny, with a high near 41. Northwest wind 10 to 15 mph, with gusts as high as 23 mph.
Sunday Night
Mostly clear, with a low around 21. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.
Monday
Sunny, with a high near 40. North northwest wind 5 to 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 20. Light and variable wind.
Tuesday
Mostly sunny, with a high near 48. Light south wind increasing to 5 to 10 mph in the morning.
Tuesday Night
Mostly cloudy, with a low around 37. South southwest wind 8 to 13 mph, with gusts as high as 23 mph.
Wednesday
A slight chance of showers. Partly sunny, with a high near 57. Southwest wind 11 to 16 mph, with gusts as high as 25 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Harrisburg IL
 37.74°N 88.58°W
Last Update:
5:41 pm CST Feb 18, 2026
Forecast Valid:
8pm CST Feb 18, 2026-6pm CST Feb 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation