Sumner Weather Forecast

    • 55
    • 83

    Sunny

    • 61
    • 90

    Sunny

    • 64
    • 99

    Hot

    • 66
    • 98

    Hot

    • 65
    • 96

    Mostly Sunny

    • 63
    • 94

    Mostly Sunny

Today 20 Aug Inner Portland Metro

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

Tonight 20 Aug Inner Portland Metro

Clear. Lows in the mid 50s. North wind 5 to 10 Mph.

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Sumner Temperature Statistics

August Temperature

Portland, Portland International Airport (3.1 miles)

  • Lowest 8 August, 2025

    54.6 °F

  • Average August

    71.6 °F

  • Highest 10 August, 2025

    99.6 °F

Climate (2020–Present)

Portland, Portland International Airport (3.1 miles)

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  • Average Low 2020–2025

    48.3 °F

  • Average 2020–2025

    56.1 °F

  • Average High 2020–2025

    65.2 °F
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