Columbia River - Martin Island Weather Forecast

    • 54
    • 69

    Becoming Sunny

    • 56
    • 79

    Mostly Sunny

    • 55
    • 83

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 56
    • 79

    Partly Sunny

    • 55
    • 79

    Partly Sunny

Today 15 Sep Cowlitz County Lowlands

Partly sunny. Highs in the upper 60s. Winds light.

Tonight 15 Sep Cowlitz County Lowlands

Mostly clear. Lows around 50. Winds light.

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Columbia River - Martin Island Temperature Statistics

September Temperature

Southwest Washington Regional Airport (11.8 miles)

  • Lowest 4 September, 2026

    48 °F

  • Average September

    60.9 °F

  • Highest 9 September, 2026

    86 °F

Climate (2021–2026)

Southwest Washington Regional Airport (11.8 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.4 °F
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