Decatur Island Weather Forecast

    • 49
    • 63

    Increasing Clouds

    • 49
    • 59

    Rain

    • 50
    • 62

    Rain Likely

    • 52
    • 64

    Partly Sunny

    • 52
    • 66

    Partly Sunny

    • 53
    • 68

    Partly Sunny

Today 19 Jun San Juan County

Mostly sunny. Highs in the 60s. Light wind becoming southwest to 10 Mph in the afternoon.

Tonight 19 Jun San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows near 50. Southwest wind 10 to 20 Mph becoming west 10 to 15 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Decatur Island Temperature Statistics

June Temperature

Friday Harbor Airport (9.3 miles)

  • Lowest 2 June, 2025

    43.6 °F

  • Average June

    58.1 °F

  • Highest 8 June, 2025

    84.7 °F

Climate (2020–Present)

Friday Harbor Airport (9.3 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.6 °F

  • Average High 2020–2025

    59.5 °F
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