Lake Oswego Weather Forecast

    • 64
    • 88

    Partly Sunny

    • 63
    • 86

    Chance Rain Showers

    • 60
    • 80

    Chance Rain Showers

    • 61
    • 79

    Mostly Cloudy

    • 60
    • 73

    Chance Rain Showers

    • 60
    • 72

    Rain Showers Likely

Today 4 Sep Inner Portland Metro

Mostly sunny. A slight chance of Showers this morning. Highs in the upper 80s. Winds light. Chance of rain 20 percent.

Tonight 4 Sep Inner Portland Metro

Partly cloudy. Lows in the mid 60s. Winds light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Oswego Temperature Statistics

September Temperature

Portland, Portland International Airport (12.4 miles)

  • Lowest 2 September, 2025

    61 °F

  • Average September

    70.7 °F

  • Highest 2 September, 2025

    89.1 °F

Climate (2020–Present)

Portland, Portland International Airport (12.4 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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