Siouxon Co Park Weather Forecast

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    Chance Rain

Today 17 Dec South Washington Cascade Foothills

A slight chance of Thunderstorms. Rain this Morning, then rain Showers this afternoon. Snow level 2500 feet. Highs in the mid 40s. Southwest wind 10 to 15 Mph, except southwest wind 20 to 25 Mph near the gorge. Near the Gorge, Gusts up to 45 Mph this morning. Chance of rain near 100 percent. Rainfall Amounts a tenth to a quarter of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 17 Dec South Washington Cascade Foothills

Rain Showers likely this Evening, then rain after midnight. Lows in the upper 30s. South wind 5 to 10 Mph. Chance of rain near 100 percent. Rainfall Amounts a tenth to a quarter of an inch.

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Siouxon Co Park Temperature Statistics

December Temperature

Southwest Washington Regional Airport (29.2 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    49.4 °F

  • Highest 15 December, 2025

    60.1 °F

Climate (2020–Present)

Southwest Washington Regional Airport (29.2 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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