Washington County State Lake Weather Forecast

    • 72
    • 99

    Hot

    • 75
    • 90

    Mostly Cloudy

    • 72
    • 95

    Partly Sunny

    • 68
    • 90

    Chance Thunderstorms

    • 65
    • 80

    Rain Showers Likely

    • 66
    • 77

    Chance Thunderstorms

    • 64
    • 79

    Chance Thunderstorms

Today 9 Aug Washington

Sunny, warmer with Highs around 100. Southwest Winds 5 to 10 Mph.

Tonight 9 Aug Washington

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly cloudy with a chance of Sprinkles after midnight. Humid with Lows in the lower 70s. Southeast Winds 5 to 10 Mph, becoming southwest with Gusts up to 20 Mph after midnight. Chance of rain 20 percent.

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Washington County State Lake Temperature Statistics

August Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 2 August, 2026

    59 °F

  • Average August

    72.7 °F

  • Highest 7 August, 2026

    89.6 °F

Climate (2021–2026)

Marysville Municipal Airport (26.1 miles)

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  • Average Low 2021–2026

    43.8 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    66.6 °F
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