Washington County State Lake Weather Forecast

    • 71
    • 94

    Chance Rain Showers

    • 73
    • 96

    Partly Sunny

    • 68
    • 96

    Rain Showers Likely

    • 61
    • 82

    Chance Rain Showers

    • 63
    • 81

    Slight Chance Thunderstorms

    • 65
    • 87

    Mostly Sunny

    • 62
    • 86

    Slight Chance Thunderstorms

Today 6 Sep Washington

Mostly sunny with a slight chance of Showers and Thunderstorms. Hot with Highs in the mid 90s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

Tonight 6 Sep Washington

Partly cloudy this Evening, then becoming mostly cloudy. Lows in the lower 70s. Southeast Winds 5 to 10 Mph with Gusts up to 25 Mph.

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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 4 September, 2026

    73.4 °F

  • Average September

    84.8 °F

  • Highest 1 September, 2026

    96.8 °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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