Washington County State Lake Weather Forecast

    • 63
    • 88

    Chance Thunderstorms

    • 61
    • 80

    Rain Showers Likely

    • 57
    • 73

    Chance Rain Showers

    • 57
    • 74

    Chance Rain Showers

    • 58
    • 76

    Partly Sunny

    • 60
    • 80

    Partly Sunny

Today 16 Sep Washington

Sunny. Highs in the upper 80s. South Winds 5 to 10 Mph.

Tonight 16 Sep Washington

Partly cloudy. A chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. South Winds around 5 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Washington County State Lake Temperature Statistics

September Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 6 September, 2025

    44.6 °F

  • Average September

    67.5 °F

  • Highest 12 September, 2025

    91.4 °F

Climate (2020–Present)

Marysville Municipal Airport (26.1 miles)

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  • Average Low 2020–2025

    43.3 °F

  • Average 2020–2025

    54.4 °F

  • Average High 2020–2025

    65.8 °F
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