Rattlesnake Mountain Weather Forecast

    • 42
    • 49

    Chance Rain

    • 47
    • 56

    Becoming Sunny

    • 47
    • 59

    Rain Likely

    • 45
    • 55

    Rain

    • 40
    • 49

    Rain

    • 37
    • 44

    Rain/Snow

    • 37
    • 42

    Rain

Today 20 Oct Foothills and Valleys of Central King County

Mostly cloudy. A chance of rain in the Morning, then a slight chance of rain early in the afternoon. A chance of rain late in the afternoon. Highs in the mid 50s to lower 60s. Southeast wind to 10 Mph in the morning becoming light.

Tonight 20 Oct Foothills and Valleys of Central King County

Mostly cloudy with a chance of rain in the Evening, then partly cloudy after midnight. Lows in the lower to mid 40s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rattlesnake Mountain Temperature Statistics

October Temperature

Stampede Pass (24.2 miles)

  • Lowest 14 October, 2025

    28 °F

  • Average October

    41.8 °F

  • Highest 6 October, 2025

    59 °F

Climate (2020–Present)

Stampede Pass (24.2 miles)

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  • Average Low 2020–2025

    36.2 °F

  • Average 2020–2025

    41.5 °F

  • Average High 2020–2025

    48.3 °F
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