Lake Forest Weather Forecast

    • 51
    • 65

    Chance Rain Showers

    • 44
    • 68

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 50
    • 70

    Mostly Sunny

    • 51
    • 69

    Partly Sunny

    • 51
    • 71

    Partly Sunny

Today 23 Sep Summit

Cloudy. A chance of Showers, mainly this morning. Highs in the mid 60s. East Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

Tonight 23 Sep Summit

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the lower 50s. East Winds 5 to 10 Mph with Gusts up to 20 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

    68.8 °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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