Lake Forest Weather Forecast

    • 63
    • 82

    Chance Rain Showers

    • 62
    • 81

    Decreasing Clouds

    • 55
    • 78

    Mostly Sunny

    • 60
    • 82

    Partly Sunny

    • 68
    • 85

    Partly Sunny

    • 70
    • 89

    Mostly Cloudy

    • 70
    • 90

    Slight Chance Thunderstorms

Today 26 Aug Summit

Partly sunny. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 26 Aug Summit

Partly cloudy this Evening, then mostly cloudy with a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the lower 60s. South Winds around 5 Mph. Chance of rain 40 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

    69.7 °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 °F

  • Average High 2021–2026

    60 °F
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