Lake Forest Weather Forecast

    • 55
    • 73

    Decreasing Clouds

    • 61
    • 81

    Mostly Cloudy

    • 58
    • 79

    Mostly Cloudy

    • 49
    • 71

    Mostly Sunny

    • 50
    • 74

    Partly Sunny

    • 52
    • 73

    Partly Sunny

    • 52
    • 73

    Partly Sunny

Today 25 May Summit

Partly cloudy. Highs in the lower 70s. North Winds around 5 Mph.

Tonight 25 May Summit

Mostly cloudy. Patchy fog after midnight. Lows in the mid 50s. Northeast Winds around 5 Mph this Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Forest Temperature Statistics

May Temperature

Portage County Airport (11.2 miles)

  • Lowest 2 May, 2026

    33.8 °F

  • Average May

    54.6 °F

  • Highest 18 May, 2026

    86.7 °F

Climate (2021–Present)

Portage County Airport (11.2 miles)

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  • Average Low 2021–2026

    40.4 °F

  • Average 2021–2026

    49.9 °F

  • Average High 2021–2026

    59.9 °F
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