Ainsworth State Park Weather Forecast

    • 55
    • 70

    Increasing Clouds

    • 52
    • 64

    Decreasing Clouds

    • 53
    • 67

    Mostly Cloudy

    • 52
    • 67

    Rain Likely

    • 48
    • 58

    Chance Rain

    • 51
    • 62

    Mostly Cloudy

    • 51
    • 62

    Partly Sunny

Today 21 Sep West Columbia River Gorge I-84 Corridor

Partly sunny with a 20 percent chance of rain. Highs in the upper 60s.

Tonight 21 Sep West Columbia River Gorge I-84 Corridor

Mostly cloudy. Lows in the mid 50s. Southwest wind 10 to 15 Mph.

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Ainsworth State Park Temperature Statistics

September Temperature

Portland, Portland-Troutdale Airport (17.4 miles)

  • Lowest 16 September, 2026

    47.6 °F

  • Average September

    62.9 °F

  • Highest 9 September, 2026

    88.6 °F

Climate (2021–2026)

Portland, Portland-Troutdale Airport (17.4 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    56.2 °F

  • Average High 2021–2026

    65.2 °F
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