Henderson Lake Weather Forecast

    • 53
    • 73

    Mostly Sunny

    • 52
    • 69

    Mostly Sunny

    • 52
    • 67

    Partly Sunny

    • 52
    • 66

    Mostly Sunny

    • 53
    • 68

    Partly Sunny

    • 53
    • 68

    Partly Sunny

Today 30 Jun San Juan County

Sunny. Highs in the 70s. North wind around 10 Mph becoming northwest in the afternoon.

Tonight 30 Jun San Juan County

Mostly clear. Lows in the 50s. West wind to 10 Mph becoming south after midnight.

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  • Temperature Real-Time

Henderson Lake Temperature Statistics

June Temperature

Friday Harbor Airport (9.3 miles)

  • Lowest 2 June, 2025

    43.6 °F

  • Average June

    57.9 °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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