Lake Forest Weather Forecast

    • 59
    • 79

    Mostly Sunny

    • 62
    • 80

    Partly Sunny

    • 59
    • 77

    Chance Rain Showers

    • 56
    • 79

    Partly Sunny

    • 59
    • 80

    Partly Sunny

    • 59
    • 80

    Chance Rain Showers

    • 57
    • 74

    Chance Thunderstorms

Today 17 Aug Summit

Partly cloudy. Near steady temperature in the upper 70s. North Winds 5 to 10 Mph.

Tonight 17 Aug Summit

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog after midnight. Cooler with Lows in the upper 50s. North Winds 5 to 10 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

    70.9 °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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