Columbia River - Willamette River Entrance Weather Forecast

    • 40
    • 47

    Chance Rain Showers

    • 40
    • 48

    Rain Showers

    • 42
    • 49

    Rain

    • 39
    • 48

    Chance Rain

    • 36
    • 47

    Chance Rain

    • 35
    • 47

    Chance Rain/Snow

    • 35
    • 45

    Chance Rain/Snow

Today 20 Dec Inner Portland Metro

Mostly cloudy. Rain Showers Likely, mainly this morning. Highs in the upper 40s. South wind 10 to 15 Mph. Chance of rain 70 percent. Rainfall Amounts a tenth to a quarter of an inch.

Tonight 20 Dec Inner Portland Metro

Mostly cloudy. A chance of rain Showers, mainly this evening. Lows around 40. South wind 5 to 10 Mph. Chance of rain 50 percent. Rainfall Amounts less than a tenth of an inch.

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Columbia River - Willamette River Entrance Temperature Statistics

December Temperature

Pearson Airfield (5.6 miles)

  • Lowest 1 December, 2025

    30.9 °F

  • Average December

    50.5 °F

  • Highest 10 December, 2025

    62.1 °F

Climate (2020–Present)

Pearson Airfield (5.6 miles)

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  • Average Low 2020–2025

    46.5 °F

  • Average 2020–2025

    55.4 °F

  • Average High 2020–2025

    64.6 °F
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