Mount Rainier National Park Weather Forecast

    • 43
    • 63

    Increasing Clouds

    • 45
    • 56

    Areas Smoke

    • 46
    • 62

    Sunny

    • 45
    • 58

    Rain Likely

    • 40
    • 49

    Chance Rain

    • 46
    • 58

    Partly Sunny

    • 47
    • 59

    Chance Rain

Today 17 Sep Cascades of Pierce and Lewis Counties

Sunny. Freezing level near 14000 feet.

Tonight 17 Sep Cascades of Pierce and Lewis Counties

Partly cloudy then becoming mostly cloudy after midnight then becoming partly cloudy. Freezing level near 13500 feet.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Rainier National Park Temperature Statistics

September Temperature

Stampede Pass (31.1 miles)

  • Lowest 15 September, 2025

    39.9 °F

  • Average September

    59.2 °F

  • Highest 2 September, 2025

    87.1 °F

Climate (2020–Present)

Stampede Pass (31.1 miles)

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  • Average Low 2020–2025

    36.3 °F

  • Average 2020–2025

    41.5 °F

  • Average High 2020–2025

    48.3 °F
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