Johnsburg Weather Forecast

    • 61
    • 81

    Partly Sunny

    • 60
    • 77

    Partly Sunny

    • 62
    • 80

    Mostly Cloudy

    • 71
    • 86

    Chance Rain Showers

    • 61
    • 86

    Chance Rain Showers

    • 59
    • 79

    Mostly Cloudy

Today 5 Sep McHenry

Mostly cloudy early in the Afternoon, then becoming partly cloudy. Highs in the lower 80s. Northeast Winds around 10 Mph.

Tonight 5 Sep McHenry

Partly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

Johnsburg Temperature Statistics

September Temperature

Chicago/Waukegan Regional Airport (19.3 miles)

  • Lowest 1 September, 2026

    70.6 °F

  • Average September

    81.1 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Chicago/Waukegan Regional Airport (19.3 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    51 °F

  • Average High 2021–2026

    59.7 °F
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