Friday Harbor Weather Forecast

    • 52
    • 73

    Slight Chance Thunderstorms

    • 51
    • 71

    Mostly Sunny

    • 54
    • 73

    Mostly Sunny

    • 53
    • 76

    Mostly Sunny

    • 53
    • 74

    Partly Sunny

    • 53
    • 73

    Partly Sunny

Today 31 Aug San Juan County

Mostly sunny. A slight chance of Thunderstorms early in the afternoon. A slight chance of rain late in the afternoon. Highs in the upper 60s to mid 70s. Light wind.

Tonight 31 Aug San Juan County

Partly cloudy. A slight chance of Thunderstorms in the evening. Lows in the 50s. Light wind becoming south to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Friday Harbor Temperature Statistics

August Temperature

Friday Harbor Airport (0.6 miles)

  • Lowest 21 August, 2025

    46.7 °F

  • Average August

    63.9 °F

  • Highest 12 August, 2025

    90.6 °F

Climate (2020–Present)

Friday Harbor Airport (0.6 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.6 °F
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