Olo Mountain Weather Forecast

    • 34
    • 48

    Becoming Sunny

    • 32
    • 45

    Mostly Sunny

    • 28
    • 42

    Partly Sunny

    • 27
    • 42

    Mostly Sunny

    • 31
    • 42

    Rain/Snow Likely

    • 36
    • 42

    Rain/Snow Likely

Today 20 Jan Cascades of Snohomish and Northern King Counties

Mostly sunny. Freezing level near 9500 feet. Afternoon pass Temperatures in the mid 30s. Light wind.

Tonight 20 Jan Cascades of Snohomish and Northern King Counties

Mostly clear. Freezing level near 8000 feet. Lows in the lower 20s. Light wind.

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Olo Mountain Temperature Statistics

January Temperature

Arlington Municipal Airport (13.7 miles)

  • Lowest 18 January, 2026

    25 °F

  • Average January

    43.4 °F

  • Highest 13 January, 2026

    57.9 °F

Climate (2021–Present)

Arlington Municipal Airport (13.7 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.8 °F
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