TodayScattered showers and thunderstorms, mainly after 11am. Mostly cloudy, with a high near 87. West wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 50%.TonightScattered showers and thunderstorms. Mostly cloudy, with a low around 65. North wind around 5 mph becoming east northeast in the evening. Winds could gust as high as 10 mph. Chance of precipitation is 50%.WednesdayScattered showers and thunderstorms. Mostly cloudy, with a high near 82. Northeast wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 50%.Wednesday NightA 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. East southeast wind around 5 mph becoming south after midnight. Winds could gust as high as 10 mph. ThursdayA 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Thursday NightA 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 71.FridayA 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.Friday NightA chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68.SaturdayMostly sunny, with a high near 88.Saturday NightPartly cloudy, with a low around 69.SundayA chance of showers and thunderstorms. Mostly sunny, with a high near 90.Sunday NightA chance of showers and thunderstorms. Mostly cloudy, with a low around 69.MondayA chance of showers and thunderstorms. Partly sunny, with a high near 84. , Today’s and tonight’s McHenry, IL weather forecast, weather conditions and Doppler radar from The Weather Channel and Weather.com, McHenry, IL Weather Forecast, with current conditions, wind, air quality, and what to expect for the next 3 days..