Boulder Island Weather Forecast

    • 53
    • 70

    Mostly Sunny

    • 53
    • 65

    Mostly Sunny

    • 52
    • 63

    Partly Sunny

    • 52
    • 63

    Partly Sunny

    • 53
    • 61

    Rain Likely

    • 52
    • 62

    Rain Likely

Today 16 Sep San Juan County

Sunny. Highs in the 70s to lower 80s. Light wind becoming east to 10 Mph in the afternoon.

Tonight 16 Sep San Juan County

Clear. Areas of smoke in the late evening and early morning. Lows in the 50s. East wind to 10 Mph becoming southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Boulder Island Temperature Statistics

September Temperature

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

  • Lowest 10 September, 2025

    50 °F

  • Average September

    57 °F

  • Highest 13 September, 2025

    66.9 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    44.6 °F

  • Average 2020–2025

    50.1 °F

  • Average High 2020–2025

    56.1 °F
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