Washington County State Lake Weather Forecast

    • 27
    • 47

    Partly Sunny

    • 34
    • 47

    Partly Sunny

    • 35
    • 57

    Mostly Sunny

    • 37
    • 56

    Partly Sunny

    • 41
    • 60

    Partly Sunny

    • 36
    • 66

    Partly Sunny

    • 34
    • 56

    Mostly Cloudy

Today 20 Dec Washington

Mostly sunny. Near steady temperature in the mid 40s. North Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 20 Dec Washington

Partly cloudy. Cold with Lows in the upper 20s. East Winds around 5 Mph, becoming south around 5 Mph after midnight.

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Washington County State Lake Temperature Statistics

December Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 14 December, 2025

    5 °F

  • Average December

    30.8 °F

  • Highest 9 December, 2025

    59 °F

Climate (2020–Present)

Marysville Municipal Airport (26.1 miles)

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  • Average Low 2020–2025

    43.5 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    66 °F
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