Rainier Weather Forecast

    • 48
    • 69

    Increasing Clouds

    • 52
    • 77

    Partly Sunny

    • 55
    • 86

    Chance Rain

    • 50
    • 77

    Slight Chance Rain

    • 49
    • 69

    Chance Rain

    • 46
    • 64

    Slight Chance Rain

    • 45
    • 64

    Chance Rain

Today 10 May Lower Columbia River

Mostly sunny. Highs in the lower 70s. Northwest wind 5 to 10 Mph.

Tonight 10 May Lower Columbia River

Partly cloudy. Lows in the upper 40s. Northwest wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainier Temperature Statistics

May Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 8 May, 2026

    48.9 °F

  • Average May

    62.1 °F

  • Highest 3 May, 2026

    91 °F

Climate (2021–Present)

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

    62.5 °F
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