Washington County State Lake Weather Forecast

    • 59
    • 68

    Mostly Cloudy

    • 55
    • 69

    Mostly Cloudy

    • 50
    • 64

    Mostly Cloudy

    • 53
    • 65

    Rain Showers Likely

    • 57
    • 64

    Rain Showers Likely

    • 60
    • 67

    Chance Rain Showers

    • 62
    • 73

    Slight Chance Rain Showers

Today 20 Sep Washington

Mostly cloudy and not as warm. Near steady temperature in the upper 60s. North Winds 5 to 10 Mph.

Tonight 20 Sep Washington

Mostly cloudy. Patchy fog after midnight. Lows around 60. North Winds 5 to 10 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 12 September, 2026

    59 °F

  • Average September

    77.8 °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

    66.7 °F
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