James Island State Park Weather Forecast

    • 52
    • 63

    Slight Chance Rain

    • 52
    • 62

    Mostly Cloudy

    • 52
    • 64

    Mostly Cloudy

    • 53
    • 65

    Chance Rain

    • 51
    • 63

    Rain Likely

    • 51
    • 62

    Chance Rain

Today 29 Aug San Juan County

Partly sunny until late afternoon then becoming sunny. A slight chance of Showers in the morning. Highs in the 60s. West wind to 10 Mph becoming southwest in the afternoon.

Tonight 29 Aug San Juan County

Partly cloudy. Lows in the upper 40s to mid 50s. Southwest wind 10 to 15 Mph.

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  • Temperature Real-Time

James Island State Park Temperature Statistics

August Temperature

Friday Harbor Airport (11.2 miles)

  • Lowest 3 August, 2026

    48.9 °F

  • Average August

    60.5 °F

  • Highest 25 August, 2026

    79 °F

Climate (2021–2026)

Friday Harbor Airport (11.2 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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