| NWS Forecast for: McHenry County Issued by: National Weather Service Chicago, IL Last Update: 605 AM CDT Sun Sep 13 2026 | |
Today: Partly cloudy in the morning, then becoming mostly cloudy. Isolated showers late in the morning. Scattered showers in the afternoon. Highs around 70. Northwest winds 5 to 10 mph. Chance of precipitation 40 percent. Tonight: Clear. Lows in the mid 40s. Northwest winds around 5 mph in the evening, becoming light and variable. Monday: Partly cloudy in the morning, then becoming mostly cloudy. Highs in the lower 70s. East winds 5 to 10 mph, increasing to southeast 10 to 15 mph with gusts up to 25 mph in the afternoon. Monday Night: Mostly cloudy. Showers likely with a chance of thunderstorms after midnight. Breezy, warmer. Near steady temperature in the upper 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of precipitation 70 percent. Tuesday: Cloudy. Showers in the morning. A slight chance of thunderstorms. A chance of showers in the afternoon. More humid with highs around 80. Southwest winds 10 to 15 mph with gusts up to 25 mph, becoming west in the afternoon. Chance of precipitation 80 percent. Tuesday Night: Mostly cloudy with a 50 percent chance of showers. Lows in the upper 50s. Wednesday: Cloudy with a slight chance of thunderstorms. Showers likely, mainly in the morning. Highs in the lower 70s. Chance of precipitation 60 percent. Wednesday Night: Cloudy. A chance of showers with a slight chance of thunderstorms in the evening, then showers with a chance of thunderstorms after midnight. Lows in the lower 60s. Chance of precipitation 80 percent. Thursday: Mostly cloudy. Showers likely, mainly in the morning. Highs in the upper 70s. Chance of precipitation 70 percent. Thursday Night: Mostly cloudy with a chance of showers. Lows in the lower 60s. Chance of precipitation 40 percent. Friday: Mostly cloudy with a chance of showers. Highs in the mid 70s. Chance of precipitation 50 percent. Friday Night: Mostly cloudy with a chance of showers. Lows in the upper 50s. Chance of precipitation 50 percent. Saturday: Mostly cloudy with a chance of showers. Highs in the lower 70s. Chance of precipitation 40 percent. | |
| Zone Forecast: McHenry County | |
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