Washington County State Lake Weather Forecast

    • 60
    • 87

    Slight Chance Thunderstorms

    • 62
    • 88

    Partly Sunny

    • 60
    • 82

    Slight Chance Thunderstorms

    • 59
    • 82

    Chance Thunderstorms

    • 61
    • 83

    Chance Thunderstorms

    • 62
    • 84

    Chance Thunderstorms

Today 31 May Washington

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 31 May Washington

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 60s. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Washington County State Lake Temperature Statistics

May Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 2 May, 2026

    30.2 °F

  • Average May

    65.1 °F

  • Highest 15 May, 2026

    91.4 °F

Climate (2021–Present)

Marysville Municipal Airport (26.1 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    66.7 °F
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