Lake Forest Weather Forecast

    • 66
    • 73

    Mostly Sunny

    • 64
    • 73

    Mostly Sunny

    • 67
    • 77

    Partly Sunny

    • 57
    • 81

    Mostly Sunny

    • 54
    • 72

    Mostly Sunny

    • 53
    • 69

    Mostly Sunny

    • 53
    • 71

    Partly Sunny

Today 20 Aug Lake

Mostly cloudy late in the morning then clearing. Highs in the mid 70s. Northeast Winds 10 to 15 Mph.

Tonight 20 Aug Lake

Mostly clear. Patchy fog in the late evening and overnight. Lows in the lower 60s. North Winds 10 to 15 Mph, becoming northeast 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Forest Temperature Statistics

August Temperature

Chicago / Wheeling, Pal-Waukee Airport (9.9 miles)

  • Lowest 2 August, 2025

    58.6 °F

  • Average August

    77.8 °F

  • Highest 9 August, 2025

    96.7 °F

Climate (2020–Present)

Chicago / Wheeling, Pal-Waukee Airport (9.9 miles)

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  • Average Low 2020–2025

    44.2 °F

  • Average 2020–2025

    53 °F

  • Average High 2020–2025

    61.5 °F
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