Lake Forest Weather Forecast

    • 54
    • 72

    Rain Showers Likely

    • 55
    • 72

    Partly Sunny

    • 56
    • 78

    Partly Sunny

    • 62
    • 81

    Chance Rain Showers

    • 63
    • 82

    Chance Thunderstorms

    • 58
    • 80

    Partly Sunny

    • 59
    • 80

    Partly Sunny

Today 23 Aug Summit

Mostly sunny. Highs in the lower 70s. West Winds 10 to 15 Mph.

Tonight 23 Aug Summit

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows in the mid 50s. West Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Forest Temperature Statistics

August Temperature

Portage County Airport (11.2 miles)

  • Lowest 4 August, 2026

    50.4 °F

  • Average August

    70.6 °F

  • Highest 5 August, 2026

    87.6 °F

Climate (2021–2026)

Portage County Airport (11.2 miles)

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  • Average Low 2021–2026

    40.5 °F

  • Average 2021–2026

    50.1 °F

  • Average High 2021–2026

    60.1 °F
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