Rainier Weather Forecast

    • 52
    • 73

    Becoming Sunny

    • 53
    • 75

    Mostly Sunny

    • 54
    • 77

    Mostly Sunny

    • 48
    • 68

    Mostly Cloudy

    • 45
    • 63

    Partly Sunny

    • 44
    • 65

    Mostly Sunny

Today 6 Oct Lower Columbia River

Mostly sunny. Highs in the mid 70s. North wind 5 to 10 Mph.

Tonight 6 Oct Lower Columbia River

Mostly clear. Lows in the lower 50s. Northwest wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainier Temperature Statistics

October Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 1 October, 2026

    46.9 °F

  • Average October

    60.3 °F

  • Highest 1 October, 2026

    78.1 °F

Climate (2021–2026)

Southwest Washington Regional Airport (2.5 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.4 °F
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