Olo Mountain Weather Forecast

    • 37
    • 42

    Rain/Snow

    • 39
    • 45

    Rain/Snow

    • 40
    • 52

    Mostly Cloudy

    • 43
    • 56

    Mostly Cloudy

    • 43
    • 56

    Slight Chance Rain

    • 45
    • 60

    Partly Sunny

Today 15 May Cascades of Snohomish and Northern King Counties

Showers likely in the Morning, then Showers, snow Showers and a slight chance of Thunderstorms in the afternoon. Snow level near 3500 feet. Rainfall Amounts a tenth to a quarter of an inch Possible, except higher Amounts possible in Thunderstorms. Snow accumulation up to 1 inch. Afternoon pass Temperatures in the upper 30s. West wind in the Passes 10 to 15 Mph.

Tonight 15 May Cascades of Snohomish and Northern King Counties

A slight chance of Thunderstorms in the evening. Rain Showers and snow Showers. Snow level near 3500 feet. Rainfall Amounts a half inch to one inch Possible, except higher Amounts possible in Thunderstorms. Snow accumulation up to 1 inch. Lows in the lower 30s. Southwest wind in the Passes around 10 Mph becoming west after midnight.

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Olo Mountain Temperature Statistics

May Temperature

Arlington Municipal Airport (13.7 miles)

  • Lowest 12 May, 2026

    44.6 °F

  • Average May

    59 °F

  • Highest 12 May, 2026

    84 °F

Climate (2021–Present)

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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