Lake Forest Weather Forecast

    • 68
    • 88

    Chance Thunderstorms

    • 68
    • 86

    Chance Rain Showers

    • 67
    • 84

    Rain Showers

    • 65
    • 84

    Rain Showers Likely

    • 67
    • 85

    Chance Thunderstorms

    • 68
    • 85

    Rain Showers Likely

Today 5 Aug Summit

Partly sunny with a chance of Showers and Thunderstorms. Highs in the upper 80s. Southwest Winds around 5 Mph. Chance of rain 50 percent.

Tonight 5 Aug Summit

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Patchy fog after midnight. Humid with Lows in the upper 60s. South Winds around 5 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 3 August, 2026

    54.7 °F

  • Average August

    70.6 °F

  • Highest 2 August, 2026

    81.9 °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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