Long Island Weather Forecast

    • 49
    • 60

    Increasing Clouds

    • 50
    • 59

    Mostly Cloudy

    • 53
    • 63

    Mostly Sunny

    • 54
    • 66

    Mostly Sunny

    • 53
    • 67

    Mostly Sunny

    • 51
    • 63

    Mostly Sunny

    • 51
    • 62

    Partly Sunny

Today 30 Apr San Juan County

Partly sunny. Patchy fog in the morning. Highs in the upper 50s to mid 60s. Light wind.

Tonight 30 Apr San Juan County

Mostly clear in the evening then becoming mostly cloudy. Lows in the mid 40s to lower 50s. West wind to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Long Island Temperature Statistics

April Temperature

Friday Harbor Airport (6.8 miles)

  • Lowest 15 April, 2026

    33.1 °F

  • Average April

    48.2 °F

  • Highest 19 April, 2026

    66 °F

Climate (2021–Present)

Friday Harbor Airport (6.8 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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