Lake Forest Weather Forecast

    • 54
    • 69

    Partly Sunny

    • 56
    • 68

    Partly Sunny

    • 55
    • 68

    Mostly Cloudy

    • 56
    • 73

    Mostly Cloudy

    • 60
    • 72

    Mostly Cloudy

    • 60
    • 73

    Chance Rain Showers

Today 26 Sep Summit

Partly cloudy in the Morning, then clearing. Highs in the upper 60s. North Winds 5 to 10 Mph.

Tonight 26 Sep Summit

Mostly clear. Lows in the lower 50s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Forest Temperature Statistics

September Temperature

Portage County Airport (11.2 miles)

  • Lowest 14 September, 2026

    50 °F

  • Average September

    67.2 °F

  • Highest 2 September, 2026

    91 °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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