Lake Forest Weather Forecast

    • 55
    • 75

    Increasing Clouds

    • 63
    • 77

    Mostly Cloudy

    • 63
    • 81

    Rain Showers

    • 52
    • 72

    Rain Showers

    • 51
    • 66

    Chance Rain Showers

    • 46
    • 67

    Slight Chance Rain Showers

Today 29 Sep Summit

Partly cloudy this Morning, then clearing. Patchy fog this morning. Highs in the mid 70s. Light and variable Winds, becoming west around 5 Mph this afternoon.

Tonight 29 Sep Summit

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 50s. South 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 25 September, 2026

    38.8 °F

  • Average September

    65.6 °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 °F

  • Average High 2021–2026

    60 °F
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