Wallace Slough - Wallace Island Weather Forecast

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    Rain Showers

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    Rain Showers

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    Rain Showers

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    Rain Showers

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    Rain Showers Likely

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    Rain Showers Likely

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    Rain Showers Likely

Today 19 Dec Lower Columbia River

Rain Showers this Morning, then rain Showers likely with a slight chance of Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall this afternoon. Highs in the upper 40s. Southwest wind 5 to 10 Mph. Chance of rain 90 percent. Rainfall Amounts a tenth to a quarter of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 19 Dec Lower Columbia River

A slight chance of Thunderstorms this evening. Rain Showers. Some Thunderstorms may produce heavy rainfall this evening. Lows in the upper 30s. South wind 5 to 10 Mph. Chance of rain 90 percent. Rainfall Amounts a tenth to a quarter of an Inch, except higher Amounts possible in Thunderstorms.

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Wallace Slough - Wallace Island Temperature Statistics

December Temperature

Southwest Washington Regional Airport (17.4 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    49.6 °F

  • Highest 15 December, 2025

    60.1 °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

    53 °F

  • Average High 2020–2025

    62.4 °F
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