Washington County State Lake Weather Forecast

    • 22
    • 46

    Increasing Clouds

    • 17
    • 44

    Slight Chance Rain

    • 15
    • 27

    Partly Sunny

    • 25
    • 42

    Mostly Sunny

    • 32
    • 53

    Mostly Cloudy

    • 27
    • 46

    Mostly Cloudy

    • 19
    • 44

    Mostly Cloudy

Today 5 Dec Washington

Partly sunny and not as cool. Near steady temperature around 40. West Winds 5 to 10 Mph.

Tonight 5 Dec Washington

Mostly clear this Evening, then becoming partly cloudy. Cold with Lows in the lower 20s. West Winds around 5 Mph, becoming east around 5 Mph after midnight.

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Washington County State Lake Temperature Statistics

December Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 2 December, 2025

    12.2 °F

  • Average December

    25.3 °F

  • Highest 2 December, 2025

    37.4 °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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