San Juan Island - Roche Harbor Weather Forecast

    • 42
    • 52

    Increasing Clouds

    • 44
    • 52

    Mostly Cloudy

    • 48
    • 56

    Chance Rain

    • 48
    • 57

    Slight Chance Rain

    • 49
    • 59

    Mostly Cloudy

    • 48
    • 59

    Slight Chance Rain

Today 16 Apr San Juan County

Sunny. Highs in the lower to mid 50s. Light wind.

Tonight 16 Apr San Juan County

Partly cloudy. Lows in the upper 30s to mid 40s. Southwest wind to 10 Mph becoming west after midnight.

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San Juan Island - Roche Harbor Temperature Statistics

April Temperature

Friday Harbor Airport (8.1 miles)

  • Lowest 7 April, 2026

    37 °F

  • Average April

    48.8 °F

  • Highest 5 April, 2026

    62.1 °F

Climate (2021–Present)

Friday Harbor Airport (8.1 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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