St. Clair Weather Forecast

    • 21
    • 52

    Rain Showers

    • 20
    • 33

    Chance Snow

    • 24
    • 42

    Chance Rain

    • 20
    • 31

    Mostly Cloudy

    • 29
    • 36

    Chance Rain

    • 32
    • 45

    Slight Chance Rain

    • 36
    • 44

    Mostly Cloudy

Today 18 Dec Lake

Partly sunny with a 20 percent chance of rain. Near steady temperature around 50. South Winds 15 to 20 Mph with Gusts up to 40 Mph.

Tonight 18 Dec Lake

Rain likely in the Evening, then rain with a chance of snow after midnight. Little or no snow accumulation. Lows in the lower 20s. South Winds 15 to 20 Mph, becoming southwest after midnight. Gusts up to 40 Mph. Chance of precipitation near 100 percent.

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St. Clair Temperature Statistics

December Temperature

Willoughby (3.1 miles)

  • Lowest 5 December, 2025

    9.9 °F

  • Average December

    26.6 °F

  • Highest 10 December, 2025

    37.6 °F

Climate (2020–Present)

Willoughby (3.1 miles)

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  • Average Low 2020–2025

    43.6 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.2 °F
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