Riverside County Park Weather Forecast

    • 60
    • 80

    Slight Chance Rain Showers

    • 61
    • 75

    Rain Showers

    • 59
    • 71

    Rain Showers

    • 57
    • 76

    Chance Rain Showers

    • 59
    • 79

    Partly Sunny

    • 60
    • 81

    Mostly Cloudy

Today 7 Sep Inner Portland Metro

Partly sunny. A slight chance of Showers in the morning. Highs in the upper 70s. Winds light. Chance of rain 20 percent.

Tonight 7 Sep Inner Portland Metro

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 50s. Winds light.

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Riverside County Park Temperature Statistics

September Temperature

Portland, Portland-Troutdale Airport (12.4 miles)

  • Lowest 2 September, 2025

    55.9 °F

  • Average September

    71.4 °F

  • Highest 2 September, 2025

    89.1 °F

Climate (2020–Present)

Portland, Portland-Troutdale Airport (12.4 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    56.1 °F

  • Average High 2020–2025

    65.2 °F
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