Rattlesnake Mountain Scenic Area Weather Forecast

    • 51
    • 66

    Mostly Sunny

    • 50
    • 64

    Partly Sunny

    • 46
    • 59

    Mostly Cloudy

    • 45
    • 57

    Mostly Cloudy

    • 45
    • 55

    Rain Likely

    • 41
    • 51

    Rain Likely

    • 42
    • 54

    Mostly Cloudy

Today 20 Sep Foothills and Valleys of Central King County

Partly sunny. Highs in the lower to mid 60s.

Tonight 20 Sep Foothills and Valleys of Central King County

Mostly clear. Patchy fog after midnight. Lows in the upper 40s to mid 50s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rattlesnake Mountain Scenic Area Temperature Statistics

September Temperature

Renton Municipal Airport (18.6 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    61.9 °F

  • Highest 9 September, 2026

    79 °F

Climate (2021–2026)

Renton Municipal Airport (18.6 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    62.2 °F
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