Lake Forest Weather Forecast

    • 39
    • 64

    Mostly Sunny

    • 47
    • 66

    Mostly Sunny

    • 51
    • 74

    Partly Sunny

    • 47
    • 70

    Partly Sunny

    • 48
    • 69

    Partly Sunny

    • 50
    • 70

    Partly Sunny

Today 5 Oct Summit

Sunny. Highs in the mid 60s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 5 Oct Summit

Clear, cooler with Lows in the upper 30s. Northwest Winds 5 to 10 Mph, becoming south after midnight.

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Lake Forest Temperature Statistics

October Temperature

Portage County Airport (11.2 miles)

  • Lowest 3 October, 2026

    43 °F

  • Average October

    61.9 °F

  • Highest 1 October, 2026

    81.1 °F

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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