Washington County State Lake Weather Forecast

    • 61
    • 79

    Increasing Clouds

    • 62
    • 72

    Slight Chance Rain Showers

    • 64
    • 73

    Rain Showers

    • 60
    • 71

    Rain Showers

    • 50
    • 66

    Chance Rain Showers

    • 49
    • 64

    Mostly Sunny

    • 53
    • 65

    Partly Sunny

Today 27 Sep Washington

Mostly sunny. Highs in the mid 60s.

Tonight 27 Sep Washington

Partly cloudy this Evening, then becoming mostly cloudy. Patchy fog after midnight. 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

September Temperature

Marysville Municipal Airport (26.1 miles)

  • Lowest 23 September, 2026

    55.4 °F

  • Average September

    74.6 °F

  • Highest 8 September, 2026

    100.4 °F

Climate (2021–2026)

Marysville Municipal Airport (26.1 miles)

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  • Average Low 2021–2026

    43.9 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    66.6 °F
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