Boulder Island Weather Forecast

    • 53
    • 63

    Mostly Cloudy

    • 53
    • 63

    Mostly Cloudy

    • 53
    • 62

    Mostly Cloudy

    • 54
    • 64

    Partly Sunny

    • 54
    • 65

    Mostly Cloudy

    • 53
    • 63

    Slight Chance Rain

Today 17 Aug San Juan County

Mostly sunny. Patchy fog in the morning. Highs in the upper 60s to mid 70s. Light wind.

Tonight 17 Aug San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog in the morning. Lows in the 50s. Light wind.

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Boulder Island Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    48 °F

  • Average August

    57.1 °F

  • Highest 5 August, 2026

    69.1 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    44.4 °F

  • Average 2021–2026

    50 °F

  • Average High 2021–2026

    56 °F
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