Boulder River Wilderness Weather Forecast

    • 58
    • 75

    Sunny

    • 53
    • 70

    Mostly Sunny

    • 55
    • 67

    Partly Sunny

    • 53
    • 69

    Partly Sunny

    • 53
    • 62

    Chance Rain

    • 50
    • 57

    Chance Rain

Today 16 Sep Cascades of Snohomish and Northern King Counties

Sunny. Haze in the afternoon. Freezing level near 15500 feet. Afternoon pass Temperatures in the upper 60s. East wind in the Passes 15 to 20 Mph.

Tonight 16 Sep Cascades of Snohomish and Northern King Counties

Clear. Areas of smoke in the evening. Haze until early morning. Freezing level near 15500 feet. Lows around 50. East wind in the Passes 10 to 15 Mph in the evening becoming light.

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Boulder River Wilderness Temperature Statistics

September Temperature

Arlington Municipal Airport (23.6 miles)

  • Lowest 9 September, 2025

    51.8 °F

  • Average September

    63.4 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Arlington Municipal Airport (23.6 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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