Lake Forest Weather Forecast

    • 72
    • 89

    Slight Chance Thunderstorms

    • 73
    • 93

    Chance Thunderstorms

    • 70
    • 85

    Rain Showers Likely

    • 65
    • 84

    Chance Thunderstorms

    • 60
    • 80

    Partly Sunny

    • 60
    • 79

    Partly Sunny

    • 59
    • 80

    Partly Sunny

Today 1 Sep Summit

Partly cloudy. Highs in the upper 80s. West Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 1 Sep Summit

Partly cloudy. Lows in the lower 70s. Southwest Winds 5 to 10 Mph.

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Lake Forest Temperature Statistics

September Temperature

Portage County Airport (11.2 miles)

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  • Average September

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Climate (2021–2026)

Portage County Airport (11.2 miles)

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  • Average Low 2021–2026

    40.5 °F

  • Average 2021–2026

    50 °F

  • Average High 2021–2026

    60 °F
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