Lake Ketchum Weather Forecast

    • 52
    • 67

    Becoming Sunny

    • 56
    • 80

    Mostly Sunny

    • 53
    • 71

    Mostly Sunny

    • 52
    • 68

    Partly Sunny

    • 54
    • 70

    Partly Sunny

    • 54
    • 71

    Chance Rain

Today 15 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Partly sunny until late afternoon then becoming sunny. Highs in the 60s to lower 70s. Light wind becoming northwest to 10 Mph in the afternoon.

Tonight 15 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Clear in the evening then becoming partly cloudy. Lows in the lower to mid 50s. Northwest wind to 10 Mph in the evening becoming light.

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Lake Ketchum Temperature Statistics

September Temperature

Arlington Municipal Airport (11.8 miles)

  • Lowest 9 September, 2025

    51.8 °F

  • Average September

    63.4 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Arlington Municipal Airport (11.8 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    59.7 °F
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