Wallace Slough - Wallace Island Weather Forecast

    • 50
    • 63

    Chance Rain Showers

    • 53
    • 70

    Mostly Sunny

    • 55
    • 82

    Mostly Sunny

    • 53
    • 66

    Chance Rain Showers

    • 52
    • 66

    Partly Sunny

    • 54
    • 70

    Mostly Sunny

Today 14 Sep Lower Columbia River

Mostly cloudy with a chance of Showers this Morning, then mostly sunny with a slight chance of Showers this afternoon. Highs in the lower 70s. West wind 5 to 10 Mph. Chance of rain 50 percent. Rainfall Amounts a tenth to a quarter of an inch.

Tonight 14 Sep Lower Columbia River

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 40s. Northwest wind 5 to 10 Mph.

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Wallace Slough - Wallace Island Temperature Statistics

September Temperature

Southwest Washington Regional Airport (17.4 miles)

  • Lowest 8 September, 2025

    52 °F

  • Average September

    65.9 °F

  • Highest 2 September, 2025

    88 °F

Climate (2020–Present)

Southwest Washington Regional Airport (17.4 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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