Lake Forest Weather Forecast

    • 57
    • 79

    Becoming Sunny

    • 60
    • 81

    Mostly Sunny

    • 60
    • 80

    Rain Showers Likely

    • 55
    • 72

    Slight Chance Thunderstorms

    • 54
    • 72

    Partly Sunny

    • 57
    • 77

    Partly Sunny

    • 61
    • 80

    Mostly Cloudy

Today 20 Aug Summit

Partly sunny with a chance of Showers and Thunderstorms. Highs in the upper 70s. Northeast Winds around 5 Mph. Chance of rain 40 percent.

Tonight 20 Aug Summit

Mostly clear. Lows in the upper 50s. Northeast Winds around 5 Mph.

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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

    71 °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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