Johnsburg Weather Forecast

    • 70
    • 85

    Thunderstorms

    • 65
    • 83

    Chance Rain Showers

    • 61
    • 77

    Partly Sunny

    • 59
    • 79

    Mostly Sunny

    • 63
    • 83

    Partly Sunny

    • 56
    • 79

    Mostly Sunny

Today 18 Aug McHenry

Mostly cloudy. A slight chance of Showers and Thunderstorms late in the Morning, then scattered Showers and Thunderstorms early to mid afternoon. Numerous Showers and Thunderstorms late in the afternoon. Highs in the mid 80s. South Winds 5 to 10 Mph. Chance of precipitation 60 percent.

Tonight 18 Aug McHenry

Mostly cloudy. Numerous Showers and Thunderstorms early in the Evening, then a chance of Showers and Thunderstorms in the late evening and overnight. Lows in the upper 60s. South Winds around 5 Mph. Chance of precipitation 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnsburg Temperature Statistics

August Temperature

Chicago/Waukegan Regional Airport (19.3 miles)

  • Lowest 3 August, 2025

    54.6 °F

  • Average August

    75.6 °F

  • Highest 9 August, 2025

    96.7 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (19.3 miles)

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  • Average Low 2020–2025

    42.3 °F

  • Average 2020–2025

    51.1 °F

  • Average High 2020–2025

    59.6 °F
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