Castle Island Weather Forecast

    • 33
    • 44

    Increasing Clouds

    • 33
    • 42

    Partly Sunny

    • 32
    • 42

    Mostly Sunny

    • 35
    • 41

    Mostly Cloudy

    • 34
    • 42

    Mostly Cloudy

    • 36
    • 43

    Mostly Cloudy

    • 36
    • 44

    Chance Rain

Today 17 Jan San Juan County

Mostly sunny. Highs in the lower to mid 40s. North wind 10 to 15 Mph with Gusts to 25 Mph.

Tonight 17 Jan San Juan County

Clear in the late evening and early morning then becoming partly cloudy. Lows in the upper 20s to mid 30s. North wind to 10 Mph becoming northeast with Gusts to 20 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

January Temperature

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

  • Lowest 12 January, 2025

    30 °F

  • Average January

    41.9 °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

    44.8 °F

  • Average 2020–2025

    50.5 °F

  • Average High 2020–2025

    56.5 °F
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