Lake Forest Weather Forecast

    • 61
    • 80

    Increasing Clouds

    • 65
    • 81

    Rain Showers Likely

    • 60
    • 82

    Slight Chance Thunderstorms

    • 61
    • 77

    Partly Sunny

    • 65
    • 85

    Chance Rain Showers

    • 63
    • 80

    Chance Rain Showers

Today 11 Sep Summit

Patchy fog in the morning. Mostly sunny. Highs around 80. East Winds around 5 Mph.

Tonight 11 Sep Summit

Partly cloudy. Lows around 60. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Forest Temperature Statistics

September Temperature

Portage County Airport (11.2 miles)

  • Lowest 6 September, 2026

    53.1 °F

  • Average September

    70.5 °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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