Lake Forest Weather Forecast

    • 18
    • 31

    Chance Snow

    • 24
    • 41

    Mostly Cloudy

    • 17
    • 28

    Mostly Cloudy

    • 27
    • 34

    Chance Rain

    • 32
    • 45

    Slight Chance Rain

    • 36
    • 44

    Chance Rain

Today 19 Dec Summit

Mostly cloudy with a 40 percent chance of snow. Snow accumulation up to 1 inch possible. Breezy and much cooler with Highs in the lower 30s. Temperature falling into the lower 20s in the afternoon. West Winds 15 to 25 Mph with Gusts up to 40 Mph.

Tonight 19 Dec Summit

Mostly cloudy in the Evening, then becoming partly cloudy. Lows around 18. West Winds 15 to 20 Mph with Gusts up to 35 Mph, becoming southwest 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Forest Temperature Statistics

December Temperature

Portage County Airport (11.2 miles)

  • Lowest 16 December, 2025

    3.2 °F

  • Average December

    23.3 °F

  • Highest 10 December, 2025

    36.5 °F

Climate (2020–Present)

Portage County Airport (11.2 miles)

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  • Average Low 2020–2025

    40.5 °F

  • Average 2020–2025

    49.8 °F

  • Average High 2020–2025

    59.7 °F
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