Ainsworth State Park Weather Forecast

    • 56
    • 75

    Increasing Clouds

    • 54
    • 71

    Mostly Sunny

    • 56
    • 76

    Mostly Sunny

    • 57
    • 72

    Chance Rain

    • 53
    • 65

    Partly Sunny

    • 59
    • 73

    Partly Sunny

    • 60
    • 75

    Chance Rain

Today 17 Sep West Columbia River Gorge I-84 Corridor

Sunny. Highs in the lower 80s. West wind 5 to 10 Mph.

Tonight 17 Sep West Columbia River Gorge I-84 Corridor

Mostly clear this Evening, then becoming mostly cloudy. 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 15 September, 2025

    46.9 °F

  • Average September

    67.2 °F

  • Highest 2 September, 2025

    89.1 °F

Climate (2020–Present)

Portland, Portland-Troutdale Airport (17.4 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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