San Juan Island - Friday Harbor Weather Forecast

    • 47
    • 51

    Rain Likely

    • 44
    • 52

    Patchy Fog

    • 43
    • 50

    Mostly Cloudy

    • 40
    • 47

    Partly Sunny

    • 39
    • 48

    Mostly Sunny

    • 39
    • 48

    Mostly Sunny

    • 38
    • 47

    Mostly Sunny

Today 12 Jan San Juan County

Rain at Times. Rainfall Amounts a tenth to a quarter of an inch possible. Highs near 50. Southeast wind 10 to 20 Mph with Gusts to 30 Mph.

Tonight 12 Jan San Juan County

Cloudy with a chance of rain in the Evening, then mostly cloudy with a slight chance of rain after midnight. Lows in the mid to upper 40s. Southeast wind 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Juan Island - Friday Harbor Temperature Statistics

January Temperature

Friday Harbor Airport (1.9 miles)

  • Lowest 8 January, 2026

    33.1 °F

  • Average January

    43.3 °F

  • Highest 3 January, 2026

    51.1 °F

Climate (2021–Present)

Friday Harbor Airport (1.9 miles)

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  • Average Low 2021–2026

    44.4 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    59.6 °F
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