Boulder Island Weather Forecast

    • 49
    • 56

    Chance Rain Showers

    • 50
    • 59

    Partly Sunny

    • 50
    • 61

    Partly Sunny

    • 50
    • 61

    Mostly Cloudy

    • 51
    • 62

    Partly Sunny

    • 51
    • 63

    Partly Sunny

Today 16 May San Juan County

Mostly sunny. A chance of Showers in the Morning, then a slight chance of Thunderstorms in the afternoon. Highs in the mid 50s to lower 60s. West wind 10 to 15 Mph.

Tonight 16 May San Juan County

Partly cloudy. Lows in the 40s. Southwest wind 10 to 20 Mph becoming west 10 to 15 Mph after midnight. Gusts to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Boulder Island Temperature Statistics

May Temperature

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

  • Lowest 12 May, 2026

    45 °F

  • Average May

    53.6 °F

  • Highest 3 May, 2026

    66.9 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    44.5 °F

  • Average 2021–2026

    50.1 °F

  • Average High 2021–2026

    56.1 °F
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