Rattlesnake Mountain Weather Forecast

    • 48
    • 52

    Rain

    • 47
    • 57

    Mostly Cloudy

    • 47
    • 59

    Partly Sunny

    • 50
    • 68

    Sunny

    • 55
    • 74

    Sunny

    • 55
    • 76

    Mostly Sunny

Today 13 Sep Foothills and Valleys of Central King County

Rain in the Morning, then rain likely early in the afternoon. A chance of rain late in the afternoon. Patchy fog in the afternoon. Rainfall Amounts a half inch to one inch possible. Highs near 60. Southwest wind to 10 Mph becoming south in the afternoon.

Tonight 13 Sep Foothills and Valleys of Central King County

Mostly cloudy. A chance of rain in the Evening, then a slight chance of rain after midnight. Lows in the upper 40s to mid 50s. South wind 10 to 15 Mph with Gusts to 25 Mph.

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Rattlesnake Mountain Temperature Statistics

September Temperature

Stampede Pass (24.2 miles)

  • Lowest 3 September, 2026

    39.9 °F

  • Average September

    51 °F

  • Highest 9 September, 2026

    71.1 °F

Climate (2021–2026)

Stampede Pass (24.2 miles)

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  • Average Low 2021–2026

    36.1 °F

  • Average 2021–2026

    41.5 °F

  • Average High 2021–2026

    48.2 °F
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