Black Diamond Lake Weather Forecast

    • 48
    • 69

    Chance Thunderstorms

    • 49
    • 69

    Chance Rain

    • 51
    • 71

    Partly Sunny

    • 51
    • 70

    Mostly Cloudy

    • 51
    • 71

    Partly Sunny

    • 55
    • 79

    Mostly Sunny

    • 54
    • 77

    Chance Rain

Today 4 Sep Foothills and Valleys of Pierce and Southern King Counties

Partly sunny. A slight chance of Thunderstorms early in the afternoon. A chance of Thunderstorms late in the afternoon. Highs near 70. Light wind becoming northwest to 10 Mph in the afternoon.

Tonight 4 Sep Foothills and Valleys of Pierce and Southern King Counties

Mostly cloudy in the evening then becoming partly cloudy. A slight chance of rain in the evening. Lows in the mid 40s to lower 50s. Light wind.

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Black Diamond Lake Temperature Statistics

September Temperature

Renton Municipal Airport (16.2 miles)

  • Lowest 2 September, 2026

    55 °F

  • Average September

    61.8 °F

  • Highest 2 September, 2026

    69.1 °F

Climate (2021–2026)

Renton Municipal Airport (16.2 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    62.2 °F
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