Summit Lake Weather Forecast

    • 56
    • 68

    Rain Showers Likely

    • 55
    • 64

    Rain

    • 55
    • 67

    Mostly Sunny

    • 58
    • 71

    Mostly Sunny

    • 55
    • 68

    Chance Rain

    • 54
    • 65

    Slight Chance Rain

    • 55
    • 67

    Mostly Sunny

Today 13 Sep San Juan County

Mostly cloudy in the morning then becoming mostly sunny. Areas of fog until late afternoon. Highs in the mid 60s to lower 70s. Light wind.

Tonight 13 Sep San Juan County

Partly cloudy in the Evening, then mostly cloudy with a slight chance of rain after midnight. Cloudy with a chance of rain late in the night. Lows in the 50s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Summit Lake Temperature Statistics

September Temperature

Eastsound, Orcas Island Airport (3.7 miles)

  • Lowest 11 September, 2025

    51.8 °F

  • Average September

    62.4 °F

  • Highest 2 September, 2025

    73.4 °F

Climate (2020–Present)

Eastsound, Orcas Island Airport (3.7 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    51.8 °F

  • Average High 2020–2025

    57.6 °F
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