Olo Mountain Weather Forecast

    • 46
    • 62

    Chance Rain Showers

    • 49
    • 63

    Partly Sunny

    • 50
    • 58

    Mostly Cloudy

    • 51
    • 64

    Partly Sunny

    • 55
    • 73

    Partly Sunny

    • 53
    • 69

    Chance Rain

Today 5 Sep Cascades of Snohomish and Northern King Counties

Partly sunny. A chance of Showers, snow Showers and a slight chance of Thunderstorms early in the afternoon. A chance of Thunderstorms and Showers late in the afternoon. Snow level near 7500 feet. Afternoon pass Temperatures in the upper 50s. Light wind.

Tonight 5 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy with a chance of Showers, a slight chance of Thunderstorms and a chance of snow Showers in the Evening, then mostly cloudy with a slight chance of rain late in the evening. Partly cloudy after midnight. Snow level near 7500 feet. Lows in the lower 40s. Light wind.

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Olo Mountain Temperature Statistics

September Temperature

Arlington Municipal Airport (13.7 miles)

  • Lowest 1 September, 2026

    51.1 °F

  • Average September

    61.8 °F

  • Highest 2 September, 2026

    71.1 °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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