Columbia River - Cooper Island Weather Forecast

    • 56
    • 83

    Sunny

    • 55
    • 71

    Partly Sunny

    • 55
    • 71

    Partly Sunny

    • 55
    • 72

    Partly Sunny

    • 59
    • 66

    Rain Likely

    • 55
    • 66

    Chance Rain

Today 16 Sep Lower Columbia River

Sunny. Highs in the upper 80s. Southeast wind 10 to 15 Mph.

Tonight 16 Sep Lower Columbia River

Mostly clear. Lows in the mid 50s. West wind 5 to 10 Mph.

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Columbia River - Cooper Island Temperature Statistics

September Temperature

Southwest Washington Regional Airport (16.8 miles)

  • Lowest 8 September, 2025

    52 °F

  • Average September

    65.8 °F

  • Highest 2 September, 2025

    88 °F

Climate (2020–Present)

Southwest Washington Regional Airport (16.8 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.3 °F
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