Sumner Weather Forecast

    • 55
    • 75

    Mostly Cloudy

    • 53
    • 73

    Mostly Cloudy

    • 54
    • 72

    Partly Sunny

    • 53
    • 69

    Chance Rain

    • 49
    • 64

    Chance Rain

    • 50
    • 66

    Partly Sunny

Today 21 Sep Inner Portland Metro

Partly sunny. Highs in the mid 70s. Winds light.

Tonight 21 Sep Inner Portland Metro

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the mid 50s. Winds light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Temperature Statistics

September Temperature

Portland, Portland International Airport (3.1 miles)

  • Lowest 8 September, 2026

    51.7 °F

  • Average September

    64.7 °F

  • Highest 9 September, 2026

    88.6 °F

Climate (2021–2026)

Portland, Portland International Airport (3.1 miles)

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  • Average Low 2021–2026

    48.3 °F

  • Average 2021–2026

    56.3 °F

  • Average High 2021–2026

    65.4 °F
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