Heat Across the Center of the Nation; Severe Thunderstorms Across the Great Lakes and Ohio Valley

Heat expands across the Desert Southwest, Plains, Mississippi Valley and Midwest into Monday. Fire weather concerns continue for portions of the Intermountain West. Active monsoonal moisture fuels thunderstorms over the Southwest with possible flash flooding. Tropical cyclone Fausto in the Pacific, should weaken as it approaches Hawaii; Dangerous surf, swells and rip currents are expected. Read More >

Current conditions at

Sterling Rockfalls (KSQI)

Lat: 41.74°NLon: 89.67°WElev: 643ft.

Fair

88°F

31°C

Humidity 80%
Wind Speed SW 5 mph
Barometer 29.90 in (1012.0 mb)
Dewpoint 81°F (27°C)
Visibility 10.00 mi
Heat Index106°F (41°C)
Last update 26 Jul 12:56 pm CDT
Extended Forecast for

Harmon IL

Heat Advisory until July 26, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 26, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • This Afternoon

    High: 91 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am.  Mostly cloudy, with a low around 75. South southwest wind around 5 mph becoming east southeast after midnight. Winds could gust as high as 10 mph.

    Low: 75 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 3pm.  Mostly sunny, with a high near 92. Heat index values as high as 106. Southeast wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph.  Chance of precipitation is 40%.

    High: 92 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 10pm.  Partly cloudy, with a low around 70. West wind 5 to 10 mph becoming north northeast after midnight. Winds could gust as high as 15 mph.

    Low: 70 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 86. North wind around 10 mph, with gusts as high as 15 mph.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 62.

    Low: 62 °F

    Clear

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 91. Heat index values as high as 106. Southwest wind 5 to 10 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 75. South southwest wind around 5 mph becoming east southeast after midnight. Winds could gust as high as 10 mph.
Monday
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 92. Heat index values as high as 106. Southeast wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Monday Night
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 70. West wind 5 to 10 mph becoming north northeast after midnight. Winds could gust as high as 15 mph.
Tuesday
Sunny, with a high near 86. North wind around 10 mph, with gusts as high as 15 mph.
Tuesday Night
Mostly clear, with a low around 62.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Clear, with a low around 62.
Thursday
Sunny, with a high near 86.
Thursday Night
Mostly cloudy, with a low around 66.
Friday
A chance of showers. Mostly cloudy, with a high near 83.
Friday Night
A chance of showers. Partly cloudy, with a low around 65.
Saturday
A chance of showers. Mostly sunny, with a high near 84.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Harmon IL
 41.73°N 89.56°W
1:21 pm CDT Jul 26, 2026
1pm CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
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Additional Resources

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Hourly Weather Forecast

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