Cottonwood Beach Weather Forecast

    • 52
    • 70

    Mostly Sunny

    • 52
    • 70

    Increasing Clouds

    • 53
    • 67

    Mostly Sunny

    • 51
    • 66

    Partly Sunny

    • 52
    • 66

    Partly Sunny

    • 53
    • 67

    Partly Sunny

    • 52
    • 66

    Mostly Cloudy

Today 16 Sep Lowlands of Western Whatcom County

Partly sunny with a slight chance of rain. Highs near 70.

Tonight 16 Sep Lowlands of Western Whatcom County

Mostly clear. Lows in the upper 40s to mid 50s. West wind to 10 Mph becoming south after midnight.

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Cottonwood Beach Temperature Statistics

September Temperature

Bellingham, Bellingham International Airport (13.7 miles)

  • Lowest 6 September, 2026

    44.7 °F

  • Average September

    60.4 °F

  • Highest 8 September, 2026

    72.6 °F

Climate (2021–2026)

Bellingham, Bellingham International Airport (13.7 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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