Ainsworth State Park Weather Forecast

    • 55
    • 66

    Mostly Sunny

    • 58
    • 75

    Mostly Sunny

    • 57
    • 79

    Mostly Sunny

    • 55
    • 71

    Partly Sunny

    • 53
    • 67

    Partly Sunny

    • 55
    • 69

    Mostly Cloudy

    • 56
    • 72

    Mostly Cloudy

Today 18 Sep West Columbia River Gorge I-84 Corridor

Mostly sunny. Highs in the mid 70s. West wind 5 to 10 Mph.

Tonight 18 Sep West Columbia River Gorge I-84 Corridor

Mostly clear. Lows in the mid 50s. Southwest wind 5 to 10 Mph.

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Ainsworth State Park Temperature Statistics

September Temperature

Portland, Portland-Troutdale Airport (17.4 miles)

  • Lowest 16 September, 2026

    46.9 °F

  • Average September

    62.8 °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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