Lake Forest Weather Forecast

    • 69
    • 88

    Partly Sunny

    • 56
    • 88

    Rain Showers

    • 43
    • 63

    Mostly Cloudy

    • 49
    • 66

    Mostly Cloudy

    • 56
    • 70

    Chance Rain Showers

    • 60
    • 75

    Chance Rain Showers

Today 18 May Summit

Sunny. Near steady temperature in the upper 80s. Southwest Winds around 15 Mph with Gusts up to 30 Mph.

Tonight 18 May Summit

Mostly cloudy. A slight chance of Showers and Thunderstorms this evening. Lows in the upper 60s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Forest Temperature Statistics

May Temperature

Portage County Airport (11.2 miles)

  • Lowest 2 May, 2026

    33.8 °F

  • Average May

    51.1 °F

  • Highest 4 May, 2026

    70.7 °F

Climate (2021–Present)

Portage County Airport (11.2 miles)

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  • Average Low 2021–2026

    40.4 °F

  • Average 2021–2026

    49.9 °F

  • Average High 2021–2026

    59.9 °F
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