Crystal Lake Weather Forecast
- 74
- 92
Chance Thunderstorms
- 67
- 91
Chance Thunderstorms
- 61
- 77
Chance Thunderstorms
- 58
- 76
Mostly Sunny
- 56
- 76
Mostly Sunny
- 57
- 77
Mostly Sunny
Today 28 Jul McHenry
Mostly cloudy in the Morning, then clearing. A slight chance of Showers and Thunderstorms through mid morning. Highs in the lower 90s. West Winds 5 to 10 Mph. Chance of precipitation 20 percent. Heat index Values up to 105.
Tonight 28 Jul McHenry
Increasing Clouds. A slight chance of Showers and Thunderstorms. Lows in the mid 70s. West Winds around 5 Mph, becoming southwest after midnight. Chance of precipitation 20 percent. Heat index Values up to 104 early in the evening.
Crystal Lake Temperature Statistics
July Temperature
Chicago / Wheeling, Pal-Waukee Airport (22.4 miles)
Lowest 18 July, 2025
59.6 °FAverage July
76.7 °FHighest 23 July, 2025
95.6 °F
Climate (2020–Present)
Chicago / Wheeling, Pal-Waukee Airport (22.4 miles)
Average Low 2020–2025
44.1 °FAverage 2020–2025
52.9 °FAverage High 2020–2025
61.5 °F