Washington County State Lake Weather Forecast

    • 39
    • 73

    Increasing Clouds

    • 49
    • 66

    Sunny

    • 42
    • 70

    Mostly Sunny

    • 39
    • 63

    Mostly Sunny

    • 45
    • 70

    Partly Sunny

    • 42
    • 66

    Partly Sunny

Today 18 Oct Washington

Mostly sunny and breezy. Highs in the mid 70s. Temperature falling into the mid 60s in the afternoon. West Winds 5 to 10 Mph with Gusts up to 20 Mph, increasing to northwest 20 to 25 Mph with Gusts up to 40 Mph in the afternoon.

Tonight 18 Oct Washington

Mostly clear. Cooler with Lows around 40. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph, Diminishing to 5 to 10 Mph with Gusts up to 20 Mph after midnight.

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Washington County State Lake Temperature Statistics

October Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 8 October, 2025

    41 °F

  • Average October

    67.4 °F

  • Highest 2 October, 2025

    87.8 °F

Climate (2020–Present)

Marysville Municipal Airport (26.1 miles)

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  • Average Low 2020–2025

    43.5 °F

  • Average 2020–2025

    54.5 °F

  • Average High 2020–2025

    65.9 °F
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