Rainier Weather Forecast

    • 58
    • 81

    Becoming Sunny

    • 58
    • 79

    Mostly Cloudy

    • 58
    • 78

    Mostly Cloudy

    • 59
    • 83

    Partly Sunny

    • 59
    • 78

    Chance Rain

    • 58
    • 72

    Slight Chance Rain

    • 58
    • 76

    Partly Sunny

Today 17 Aug Lower Columbia River

Sunny. Highs in the mid 80s. Northwest wind 5 to 10 Mph.

Tonight 17 Aug Lower Columbia River

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the upper 50s. Northwest wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainier Temperature Statistics

August Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 9 August, 2026

    54 °F

  • Average August

    68.3 °F

  • Highest 5 August, 2026

    93.9 °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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