Olo Mountain Weather Forecast

    • 39
    • 50

    Chance Rain Showers

    • 38
    • 52

    Mostly Cloudy

    • 42
    • 56

    Partly Sunny

    • 51
    • 65

    Partly Sunny

    • 55
    • 72

    Partly Sunny

    • 50
    • 66

    Slight Chance Rain

Today 29 May Cascades of Snohomish and Northern King Counties

Cloudy. Snow Showers likely in the morning. Rain Showers likely through the day. A slight chance of snow Showers in the afternoon. Snow level near 8000 feet. Rainfall Amounts less than a tenth of an inch likely. No snow accumulation. Afternoon pass Temperatures in the upper 40s. Southwest wind in the Passes around 10 Mph becoming west in the afternoon. Gusts to 25 Mph.

Tonight 29 May Cascades of Snohomish and Northern King Counties

Mostly cloudy with a slight chance of Showers in the Evening, then mostly cloudy after midnight. Snow level near 5000 feet in the evening. No snow accumulation. Freezing level near 5000 feet after midnight. Lows in the mid 30s. West wind in the Passes around 10 Mph with Gusts to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Olo Mountain Temperature Statistics

May Temperature

Arlington Municipal Airport (13.7 miles)

  • Lowest 18 May, 2026

    42.1 °F

  • Average May

    56.8 °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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