Olo Mountain Weather Forecast

    • 48
    • 66

    Rain Likely

    • 49
    • 55

    Rain Likely

    • 46
    • 57

    Mostly Cloudy

    • 47
    • 63

    Partly Sunny

    • 51
    • 71

    Mostly Sunny

    • 53
    • 75

    Mostly Sunny

Today 12 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy. Freezing level near 10000 feet. Afternoon pass Temperatures in the lower 60s. Light wind. Gusts to 20 Mph in the afternoon.

Tonight 12 Sep Cascades of Snohomish and Northern King Counties

A chance of rain and snow in the Evening, then rain and snow after midnight. Snow level near 8000 feet. Rainfall Amounts a half inch to one inch possible. No snow accumulation. Lows in the lower 40s. Light wind.

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Olo Mountain Temperature Statistics

September Temperature

Arlington Municipal Airport (13.7 miles)

  • Lowest 8 September, 2026

    46 °F

  • Average September

    60.7 °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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