Mount Baker National Forest Weather Forecast

    • 54
    • 66

    Becoming Sunny

    • 57
    • 75

    Sunny

    • 56
    • 74

    Mostly Sunny

    • 57
    • 73

    Mostly Sunny

    • 59
    • 78

    Mostly Sunny

    • 54
    • 73

    Chance Rain

Today 15 Sep Cascades of Snohomish and Northern King Counties

Mostly sunny. Areas of fog in the morning. Freezing level near 12000 feet. Afternoon pass Temperatures in the mid 60s. Light wind.

Tonight 15 Sep Cascades of Snohomish and Northern King Counties

Clear. Areas of smoke in the late evening and early morning. Haze after midnight. Freezing level near 14500 feet. Lows in the upper 40s. Light wind becoming east around 10 Mph with Gusts to 25 Mph after midnight.

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Mount Baker National Forest Temperature Statistics

September Temperature

Arlington Municipal Airport (45.4 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 (45.4 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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