Olo Mountain Weather Forecast

    • 50
    • 67

    Decreasing Clouds

    • 49
    • 69

    Partly Sunny

    • 47
    • 63

    Partly Sunny

    • 46
    • 60

    Mostly Cloudy

    • 46
    • 59

    Mostly Cloudy

    • 45
    • 57

    Chance Rain

Today 19 Sep Cascades of Snohomish and Northern King Counties

Mostly sunny. Freezing level near 13000 feet. Afternoon pass Temperatures in the upper 60s. Light wind.

Tonight 19 Sep Cascades of Snohomish and Northern King Counties

Mostly clear. Freezing level near 13500 feet. Lows in the upper 40s. Light wind.

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Olo Mountain Temperature Statistics

September Temperature

Arlington Municipal Airport (13.7 miles)

  • Lowest 16 September, 2026

    44.1 °F

  • Average September

    59.9 °F

  • Highest 9 September, 2026

    78.1 °F

Climate (2021–2026)

Arlington Municipal Airport (13.7 miles)

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  • Average Low 2021–2026

    42.6 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.9 °F
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