Lake Ketchum Weather Forecast

    • 42
    • 54

    Rain

    • 40
    • 47

    Rain

    • 37
    • 48

    Rain

    • 37
    • 44

    Rain

    • 36
    • 44

    Rain

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    • 46

    Rain/Snow Likely

Today 16 Dec Lowlands of Western Skagit and Northwestern Snohomish Counties

Windy. Partly sunny in the morning. Rain at Times through the day. Patchy fog late in the afternoon. Rainfall Amounts a tenth to a quarter of an inch possible. Highs in the lower to mid 50s. Southeast wind 15 to 30 Mph.

Tonight 16 Dec Lowlands of Western Skagit and Northwestern Snohomish Counties

Very windy. Patchy fog in the evening. Rain until early Morning, then mostly cloudy with a chance of rain in the morning. Rainfall Amounts a half inch to one inch possible. Lows in the upper 30s to mid 40s. South wind 20 to 35 Mph becoming west 25 to 40 Mph after midnight.

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Lake Ketchum Temperature Statistics

December Temperature

Arlington Municipal Airport (11.8 miles)

  • Lowest 1 December, 2025

    30 °F

  • Average December

    47.1 °F

  • Highest 8 December, 2025

    57 °F

Climate (2020–Present)

Arlington Municipal Airport (11.8 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    59.8 °F
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