Lopez Island - Cape Saint Mary Weather Forecast

    • 55
    • 68

    Rain Likely

    • 53
    • 65

    Rain

    • 52
    • 63

    Mostly Sunny

    • 55
    • 68

    Mostly Sunny

    • 55
    • 72

    Mostly Sunny

    • 55
    • 70

    Mostly Sunny

Today 31 Jul San Juan County

Sunny. Highs in the 70s. Light wind.

Tonight 31 Jul San Juan County

Partly cloudy. A chance of rain in the morning. Lows in the 50s. South wind to 10 Mph becoming southwest after midnight.

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Lopez Island - Cape Saint Mary Temperature Statistics

July Temperature

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

  • Lowest 14 July, 2026

    46 °F

  • Average July

    57.6 °F

  • Highest 25 July, 2026

    73.9 °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

    56 °F
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