Henderson Lake Weather Forecast

    • 46
    • 59

    Becoming Sunny

    • 49
    • 60

    Rain

    • 51
    • 61

    Rain

    • 46
    • 59

    Rain

    • 43
    • 55

    Rain

    • 42
    • 54

    Rain

Today 21 Oct San Juan County

Mostly cloudy with a slight chance of rain in the Morning, then mostly sunny in the afternoon. Highs in the mid 50s to lower 60s. Southeast wind to 10 Mph in the morning becoming light.

Tonight 21 Oct San Juan County

Mostly clear. Lows in the 40s. Light wind.

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Henderson Lake Temperature Statistics

October Temperature

Friday Harbor Airport (9.3 miles)

  • Lowest 15 October, 2025

    37 °F

  • Average October

    51.7 °F

  • Highest 5 October, 2025

    64.9 °F

Climate (2020–Present)

Friday Harbor Airport (9.3 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.5 °F
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