Rattlesnake Lake Weather Forecast

    • 50
    • 69

    Increasing Clouds

    • 46
    • 63

    Mostly Cloudy

    • 46
    • 63

    Mostly Cloudy

    • 47
    • 61

    Rain Likely

    • 43
    • 56

    Rain Likely

    • 44
    • 59

    Mostly Cloudy

    • 45
    • 60

    Chance Rain

Today 21 Sep Foothills and Valleys of Central King County

Sunny in the morning then becoming partly sunny. Areas of fog in the morning. Highs near 70. Light wind.

Tonight 21 Sep Foothills and Valleys of Central King County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 50s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rattlesnake Lake Temperature Statistics

September Temperature

Renton Municipal Airport (20.5 miles)

  • Lowest 6 September, 2026

    51.1 °F

  • Average September

    61.6 °F

  • Highest 9 September, 2026

    79 °F

Climate (2021–2026)

Renton Municipal Airport (20.5 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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