Washington County State Lake Weather Forecast

    • 31
    • 63

    Slight Chance Rain

    • 13
    • 35

    Chance Wintry Mix

    • 13
    • 26

    Sunny

    • 24
    • 41

    Partly Sunny

    • 20
    • 48

    Mostly Sunny

    • 20
    • 38

    Mostly Cloudy

    • 25
    • 42

    Partly Sunny

Today 27 Dec Washington

Mostly sunny. Highs in the lower 60s. Southwest Winds around 5 Mph.

Tonight 27 Dec Washington

Mostly cloudy. A slight chance of rain in the Evening, then a chance of rain after midnight. Lows in the mid 30s. South Winds around 5 Mph, increasing to northeast 15 to 20 Mph with Gusts up to 35 Mph after midnight. Chance of rain 30 percent.

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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

    34.2 °F

  • Highest 23 December, 2025

    62.6 °F

Climate (2020–Present)

Marysville Municipal Airport (26.1 miles)

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  • Average Low 2020–2025

    43.6 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    66 °F
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