Friday Harbor Weather Forecast

    • 41
    • 51

    Chance Rain

    • 40
    • 50

    Rain

    • 41
    • 52

    Chance Rain

    • 40
    • 52

    Mostly Cloudy

    • 43
    • 54

    Mostly Cloudy

    • 44
    • 56

    Mostly Cloudy

    • 45
    • 58

    Mostly Cloudy

Today 31 Mar San Juan County

Mostly cloudy. Highs near 50. Light wind.

Tonight 31 Mar San Juan County

Mostly cloudy late in the Evening, then rain likely after midnight. Rainfall Amounts less than a tenth of an inch likely. Lows in the upper 30s to mid 40s. Light wind becoming southeast to 10 Mph with Gusts to 20 Mph after midnight.

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Friday Harbor Temperature Statistics

March Temperature

Friday Harbor Airport (0.6 miles)

  • Lowest 10 March, 2026

    30 °F

  • Average March

    44.6 °F

  • Highest 20 March, 2026

    59 °F

Climate (2021–Present)

Friday Harbor Airport (0.6 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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