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City of McHenry, ILMcHenry, IL 7-Day Weather Forecast
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McHenry Weather Forecast
McHenry, IL Weather Forecast Date: 256 AM CDT Fri Sep 04 2026
Weather forecast for McHenry, IL
Morning Hi: 71°FHi: 22°C |
Early This Morning... Partly cloudy. A slight chance of showers and thunderstorms. Temperatures in the lower 70s. Southwest winds around 5 mph. Chance of precipitation 20%. |
Today Hi: 91°FHi: 33°C Lo: 70°F Lo: 21°C |
Today... Partly cloudy in the morning then clearing. A slight chance of showers and thunderstorms in the morning. Hot, humid. Highs in the lower 90s. South winds 5 to 10 mph, becoming southwest in the afternoon. Chance of precipitation 20%. Heat index values up to 105. |
| Sat Hi: 85°FHi: 29°C Lo: 65°F Lo: 18°C |
Saturday... Partly cloudy. Humid with highs in the mid 80s. North winds 5 to 10 mph. |
| Sun Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Sunday... Partly cloudy. Highs in the lower 80s. East winds 5 to 10 mph. |
| Labor Day Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Labor Day... Partly cloudy. Highs in the lower 80s. |
Tue Hi: 81°FHi: 27°C Lo: 70°F Lo: 21°C |
Tuesday... Mostly cloudy. Highs in the lower 80s. |
| Wed Hi: 85°FHi: 29°C Lo: 65°F Lo: 18°C |
Wednesday... Mostly cloudy. Highs in the mid 80s. |
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