Long Island Weather Forecast

    • 38
    • 46

    Mostly Cloudy

    • 37
    • 44

    Clearing Late

    • 36
    • 44

    Mostly Sunny

    • 36
    • 44

    Partly Sunny

    • 37
    • 44

    Mostly Cloudy

    • 39
    • 45

    Mostly Cloudy

    • 42
    • 48

    Chance Rain

Today 21 Jan San Juan County

Mostly sunny. Highs in the 40s. Light wind.

Tonight 21 Jan San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the 30s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Long Island Temperature Statistics

January Temperature

Friday Harbor Airport (6.8 miles)

  • Lowest 8 January, 2026

    33.1 °F

  • Average January

    44.4 °F

  • Highest 13 January, 2026

    53.1 °F

Climate (2021–Present)

Friday Harbor Airport (6.8 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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