Lake Forest Weather Forecast

    • 59
    • 77

    Decreasing Clouds

    • 61
    • 83

    Mostly Sunny

    • 62
    • 83

    Mostly Cloudy

    • 56
    • 78

    Chance Rain Showers

    • 52
    • 71

    Chance Rain Showers

    • 50
    • 67

    Slight Chance Rain Showers

Today 21 Aug Summit

Mostly cloudy this Morning, then becoming partly sunny. Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 21 Aug Summit

Partly cloudy in the Evening, then clearing. Lows around 60. Northeast 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 2 August, 2025

    49.6 °F

  • Average August

    70.2 °F

  • Highest 12 August, 2025

    90.7 °F

Climate (2020–Present)

Portage County Airport (11.2 miles)

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  • Average Low 2020–2025

    40.8 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    60 °F
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