Lopez Island - Cape Saint Mary Weather Forecast

    • 52
    • 62

    Slight Chance Rain

    • 52
    • 64

    Mostly Sunny

    • 52
    • 64

    Mostly Sunny

    • 52
    • 63

    Partly Sunny

    • 51
    • 62

    Partly Sunny

    • 52
    • 63

    Partly Sunny

Today 15 Sep San Juan County

Patchy fog in the morning. Mostly cloudy with a slight chance of rain in the Morning, then sunny in the afternoon. Highs in the 60s. Light wind becoming north to 10 Mph in the afternoon.

Tonight 15 Sep San Juan County

Mostly clear. Lows in the upper 40s to mid 50s. Light wind.

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Lopez Island - Cape Saint Mary Temperature Statistics

September Temperature

Whidbey Island Naval Air Station - Ault Field (8.7 miles)

  • Lowest 6 September, 2026

    46.9 °F

  • Average September

    57.4 °F

  • Highest 7 September, 2026

    69.1 °F

Climate (2021–2026)

Whidbey Island Naval Air Station - Ault Field (8.7 miles)

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  • Average Low 2021–2026

    44.4 °F

  • Average 2021–2026

    50 °F

  • Average High 2021–2026

    55.9 °F
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