San Juan Island - Deadman Bay Weather Forecast

    • 54
    • 74

    Rain Likely

    • 51
    • 69

    Rain Likely

    • 51
    • 66

    Mostly Sunny

    • 55
    • 69

    Mostly Sunny

    • 55
    • 73

    Mostly Sunny

    • 55
    • 72

    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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San Juan Island - Deadman Bay Temperature Statistics

July Temperature

Friday Harbor Airport (5 miles)

  • Lowest 5 July, 2026

    46.9 °F

  • Average July

    59.9 °F

  • Highest 21 July, 2026

    84 °F

Climate (2021–2026)

Friday Harbor Airport (5 miles)

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  • Average Low 2021–2026

    44.5 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    59.7 °F
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