Black Diamond Airport Weather Forecast

    • 49
    • 66

    Decreasing Clouds

    • 51
    • 74

    Mostly Sunny

    • 54
    • 79

    Partly Sunny

    • 50
    • 70

    Partly Sunny

    • 50
    • 66

    Chance Rain

    • 49
    • 66

    Slight Chance Rain

    • 49
    • 71

    Partly Sunny

Today 7 Sep Foothills and Valleys of Pierce and Southern King Counties

Mostly cloudy. A slight chance of rain early in the afternoon. Highs in the mid 60s to lower 70s. Light wind.

Tonight 7 Sep Foothills and Valleys of Pierce and Southern King Counties

Partly cloudy. Lows near 50. Light wind.

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Black Diamond Airport Temperature Statistics

September Temperature

Renton Municipal Airport (15.5 miles)

  • Lowest 5 September, 2026

    52 °F

  • Average September

    60.6 °F

  • Highest 5 September, 2026

    70 °F

Climate (2021–2026)

Renton Municipal Airport (15.5 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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