Castle Island Weather Forecast

    • 35
    • 48

    Rain/Snow

    • 34
    • 42

    Rain/Snow

    • 30
    • 40

    Rain/Snow

    • 24
    • 36

    Chance Rain/Snow

    • 23
    • 33

    Slight Chance Snow Showers

    • 25
    • 34

    Slight Chance Rain/Snow

    • 28
    • 36

    Chance Rain/Snow

Today 31 Jan San Juan County

Windy. Cloudy with rain likely in the Morning, then cloudy with a chance of rain in the afternoon. Rainfall Amounts a tenth to a quarter of an inch possible. Highs in the mid 40s to lower 50s. Southeast wind 15 to 30 Mph with Gusts to 40 Mph decreasing to 10 to 20 Mph with Gusts to 30 Mph in the afternoon.

Tonight 31 Jan San Juan County

Breezy. Mostly cloudy then becoming partly cloudy after midnight then becoming mostly cloudy. Rain Showers in the evening. A chance of rain and snow Showers after midnight. Snow level near 500 feet after midnight. No snow accumulation. Lows in the 30s. West wind 15 to 25 Mph.

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Castle Island Temperature Statistics

January Temperature

Whidbey Island Naval Air Station - Ault Field (8.1 miles)

  • Lowest 25 January, 2025

    24.1 °F

  • Average January

    38.8 °F

  • Highest 9 January, 2025

    48.9 °F

Climate (2020–Present)

Whidbey Island Naval Air Station - Ault Field (8.1 miles)

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  • Average Low 2020–2025

    44.7 °F

  • Average 2020–2025

    50.4 °F

  • Average High 2020–2025

    56.4 °F
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