Washington County State Lake Weather Forecast

    • 75
    • 98

    Slight Chance Thunderstorms

    • 75
    • 94

    Chance Rain Showers

    • 76
    • 95

    Mostly Sunny

    • 76
    • 95

    Mostly Sunny

    • 74
    • 95

    Partly Sunny

    • 72
    • 93

    Partly Sunny

    • 70
    • 91

    Mostly Sunny

Today 30 Aug Washington

Sunny, hot with Highs in the upper 90s. Southwest Winds 15 to 20 Mph.

Tonight 30 Aug Washington

Mostly clear this Evening, then partly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows in the mid 70s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Washington County State Lake Temperature Statistics

August Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 2 August, 2026

    59 °F

  • Average August

    75.3 °F

  • Highest 9 August, 2026

    95 °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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