San Juan Island - Roche Harbor Weather Forecast

    • 44
    • 53

    Increasing Clouds

    • 45
    • 53

    Rain

    • 46
    • 54

    Rain Likely

    • 46
    • 54

    Slight Chance Rain

    • 45
    • 53

    Chance Rain

    • 45
    • 52

    Slight Chance Rain

Today 23 Oct San Juan County

Sunny. Highs in the lower to mid 50s. Northwest wind 10 to 15 Mph decreasing to 10 Mph or less in the afternoon.

Tonight 23 Oct San Juan County

Clear in the evening then becoming partly cloudy. Lows in the upper 30s to mid 40s. Light wind becoming southeast to 10 Mph after midnight.

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San Juan Island - Roche Harbor Temperature Statistics

October Temperature

Friday Harbor Airport (8.1 miles)

  • Lowest 12 October, 2026

    41 °F

  • Average October

    52.8 °F

  • Highest 2 October, 2026

    66 °F

Climate (2021–2026)

Friday Harbor Airport (8.1 miles)

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  • Average Low 2021–2026

    44.5 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    59.7 °F
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