Siouxon Co Park Weather Forecast

    • 50
    • 69

    Mostly Cloudy

    • 52
    • 67

    Mostly Cloudy

    • 55
    • 73

    Mostly Cloudy

    • 57
    • 69

    Chance Rain Showers

    • 51
    • 72

    Partly Sunny

    • 54
    • 75

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

Today 3 Aug South Washington Cascade Foothills

Cloudy this Morning, then becoming partly sunny. Highs in the lower 70s. West wind 5 to 10 Mph.

Tonight 3 Aug South Washington Cascade Foothills

Mostly cloudy. Lows in the lower 50s. West wind 5 to 10 Mph.

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Siouxon Co Park Temperature Statistics

August Temperature

Southwest Washington Regional Airport (29.2 miles)

  • Lowest 1 August, 2025

    59 °F

  • Average August

    67.8 °F

  • Highest 1 August, 2025

    82 °F

Climate (2020–Present)

Southwest Washington Regional Airport (29.2 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.2 °F
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