Riverside County Park Weather Forecast

    • 59
    • 82

    Chance Thunderstorms

    • 58
    • 87

    Partly Sunny

    • 58
    • 89

    Slight Chance Rain Showers

    • 56
    • 80

    Partly Sunny

    • 56
    • 79

    Partly Sunny

    • 58
    • 82

    Mostly Sunny

Today 27 Aug Cowlitz County Lowlands

Mostly cloudy with a chance of Thunderstorms this Morning, then partly sunny with a slight chance of Thunderstorms this afternoon. Highs in the mid 80s. Winds light. Chance of precipitation 40 percent. Rainfall Amounts less than a tenth of an inch.

Tonight 27 Aug Cowlitz County Lowlands

Partly cloudy. Lows in the upper 50s. Winds light.

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Riverside County Park Temperature Statistics

August Temperature

Southwest Washington Regional Airport (5 miles)

  • Lowest 8 August, 2025

    50 °F

  • Average August

    69.1 °F

  • Highest 12 August, 2025

    99 °F

Climate (2020–Present)

Southwest Washington Regional Airport (5 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.3 °F
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