Olo Mountain Weather Forecast

    • 39
    • 54

    Increasing Clouds

    • 40
    • 58

    Partly Sunny

    • 48
    • 58

    Rain

    • 45
    • 53

    Rain

    • 44
    • 54

    Mostly Cloudy

    • 43
    • 54

    Chance Rain

Today 26 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy with a slight chance of snow in the Morning, then sunny in the afternoon. No snow accumulation. Freezing level near 6500 feet in the afternoon. Afternoon pass Temperatures around 50. Southwest wind in the Passes around 10 Mph in the morning becoming light.

Tonight 26 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy. Freezing level near 8500 feet. Lows in the mid 30s. Light wind.

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Olo Mountain Temperature Statistics

September Temperature

Arlington Municipal Airport (13.7 miles)

  • Lowest 24 September, 2026

    43 °F

  • Average September

    58.7 °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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