Lake Forest Weather Forecast

    • 52
    • 72

    Mostly Sunny

    • 65
    • 81

    Rain Showers Likely

    • 67
    • 83

    Chance Rain Showers

    • 64
    • 84

    Chance Rain Showers

    • 60
    • 78

    Partly Sunny

    • 60
    • 79

    Chance Rain Showers

Today 14 Sep Summit

Mostly sunny. Cooler with Highs in the lower 70s. North Winds 5 to 10 Mph.

Tonight 14 Sep Summit

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 50s. Northeast Winds around 5 Mph, becoming southeast after midnight.

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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

    70.6 °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

    50.1 °F

  • Average High 2021–2026

    60.1 °F
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