Weather Alert
McHenry Weather Warning NWS WEATHER ALERT FOR THE MCHENRY, IL AREA - Issued: 337 AM CDT Fri Sep 4 2026 McHenry Weather Warning

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McHenry, IL Weather Forecast

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McHenry, IL Weather Forecast

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McHenry IL weather - Mostly Cloudy - 70°F
Mostly Cloudy
70°F
Updated 6:40 am
Feels Like 74°F
Humidity 96%
Wind NNE 16 mph
Barometer  29.92 in
Dew Point 69°F
McHenry IL weather - Mostly Cloudy - 21°C
Mostly Cloudy
21°C
Updated 6:40 am
Feels Like 23°C
Humidity 96%
Wind NNE 26 km/h
Barometer  101.3 kPa
Dew Point 21°C
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McHenry Weather Forecast

EARLY THIS MORNING TODAY TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT LABOR DAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY
McHenry, IL Weather - Early This Morning Chance Of T-Storm McHenry, IL Weather - Today Clearing McHenry, IL Weather - Tonight Chance Of T-Storm McHenry, IL Weather - Saturday Partly Cloudy McHenry, IL Weather - Saturday Night Partly Cloudy McHenry, IL Weather - Sunday Partly Cloudy McHenry, IL Weather - Sunday Night Partly Cloudy McHenry, IL Weather - Labor Day Partly Cloudy McHenry, IL Weather - Monday Night Mostly Cloudy McHenry, IL Weather - Tuesday Mostly Cloudy McHenry, IL Weather - Tuesday Night Chance Of Showers McHenry, IL Weather - Wednesday Mostly Cloudy
Chance of T-Storm Clearing Chance of T-Storm Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Mostly Cloudy Mostly Cloudy Chance of Showers Mostly Cloudy
Hi: 71°FHi: 22°C
 Hi: 91°FHi: 33°C
 Lo: 70°FLo: 21°C Hi: 85°FHi: 29°C
 Lo: 65°FLo: 18°C Hi: 81°FHi: 27°C
 Lo: 61°FLo: 16°C Hi: 81°FHi: 27°C
 Lo: 65°FLo: 18°C Hi: 81°FHi: 27°C
 Lo: 70°FLo: 21°C Hi: 85°FHi: 29°C
POP: 20% POP: 20% POP: 20% POP: 50%
POP = Probability of Precipitation.
Weather Outlook Updated: 256 AM CDT Fri Sep 04 2026 McHenry, IL Weather - WeatherWorld.com

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Issued: 619 AM CDT Fri Sep 4 2026

Key Messages

  • Today will be another unseasonably hot and humid day with peak afternoon heat indices of 100 to 110 degrees.
  • Gradually turning cooler and less humid this weekend, though remaining seasonably warm.
  • Moderate to high swim risk expected late Saturday into early Sunday during the final weekend of beach season.

Discussion

... Issued at 301 AM CDT Fri Sep 4 2026

An unusually strong late season mid-upper level ridge of high pressure continues to dominate the weather across much of the central a...