Olo Mountain Weather Forecast

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    Chance Rain Showers

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    Rain Showers Likely

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    Rain Showers Likely

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    Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

Today 7 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy. Areas of smoke in the morning. A slight chance of Showers in the Morning, then a chance of Showers in the afternoon. A slight chance of Thunderstorms in the afternoon. Snow level near 11000 feet. Afternoon pass Temperatures in the mid 60s. Light wind.

Tonight 7 Sep Cascades of Snohomish and Northern King Counties

Mostly cloudy with a slight chance of rain. Snow level near 10500 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 3 September, 2025

    55 °F

  • Average September

    64.8 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Arlington Municipal Airport (13.7 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    59.7 °F
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