Downtown Portland Weather Forecast

    • 53
    • 77

    Becoming Sunny

    • 55
    • 80

    Mostly Sunny

    • 59
    • 79

    Chance Rain Showers

    • 53
    • 71

    Slight Chance Thunderstorms

    • 56
    • 76

    Mostly Sunny

    • 59
    • 80

    Chance Rain

Today 18 Sep Inner Portland Metro

Sunny. Highs in the upper 70s. Northwest wind 5 to 10 Mph.

Tonight 18 Sep Inner Portland Metro

Mostly clear. Lows in the lower 50s. Northwest wind 5 to 10 Mph.

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Downtown Portland Temperature Statistics

September Temperature

Portland, Portland International Airport (6.2 miles)

  • Lowest 15 September, 2025

    48.9 °F

  • Average September

    67.8 °F

  • Highest 2 September, 2025

    89.1 °F

Climate (2020–Present)

Portland, Portland International Airport (6.2 miles)

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  • Average Low 2020–2025

    48.3 °F

  • Average 2020–2025

    56.1 °F

  • Average High 2020–2025

    65.3 °F
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