Rainier Weather Forecast

    • 40
    • 46

    Rain Showers

    • 40
    • 46

    Rain Showers

    • 40
    • 47

    Rain Showers

    • 38
    • 47

    Rain Showers Likely

    • 35
    • 45

    Chance Rain Showers

    • 34
    • 44

    Rain Showers Likely

    • 35
    • 44

    Chance Rain/Snow

Today 20 Dec Lower Columbia River

Rain Showers. Highs in the upper 40s. South wind 5 to 10 Mph. Chance of rain 90 percent. Rainfall Amounts a tenth to a quarter of an inch.

Tonight 20 Dec Lower Columbia River

Mostly cloudy. Rain Showers Likely, mainly this evening. Lows in the upper 30s. Southeast wind 5 to 10 Mph. Chance of rain 70 percent. Rainfall Amounts a tenth to a quarter of an inch.

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  • Temperature Real-Time

Rainier Temperature Statistics

December Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 1 December, 2025

    35.1 °F

  • Average December

    49.4 °F

  • Highest 15 December, 2025

    60.1 °F

Climate (2020–Present)

Southwest Washington Regional Airport (2.5 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    53 °F

  • Average High 2020–2025

    62.4 °F
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