Sumas Mountain Weather Forecast

    • 45
    • 57

    Chance Rain

    • 53
    • 69

    Mostly Sunny

    • 60
    • 76

    Mostly Sunny

    • 61
    • 78

    Mostly Sunny

    • 59
    • 75

    Mostly Sunny

    • 56
    • 70

    Mostly Sunny

Today 2 Aug Foothills and Valleys of the North Cascades

Mostly cloudy. A chance of Showers through the day. A slight chance of Thunderstorms early in the afternoon. Highs in the mid 60s to lower 70s. Light wind.

Tonight 2 Aug Foothills and Valleys of the North Cascades

Mostly clear. Lows in the mid 40s to lower 50s. Northwest wind to 10 Mph in the evening becoming light.

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Sumas Mountain Temperature Statistics

August Temperature

Bellingham, Bellingham International Airport (16.2 miles)

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  • Average August

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Climate (2021–2026)

Bellingham, Bellingham International Airport (16.2 miles)

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  • Average Low 2021–2026

    43.9 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    59.1 °F
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