Black Diamond Lake Weather Forecast

    • 49
    • 70

    Mostly Cloudy

    • 40
    • 69

    Partly Sunny

    • 36
    • 55

    Partly Sunny

    • 37
    • 58

    Partly Sunny

    • 40
    • 63

    Mostly Sunny

Today 5 Apr Foothills and Valleys of Pierce and Southern King Counties

Partly sunny. Highs near 70. Light wind.

Tonight 5 Apr Foothills and Valleys of Pierce and Southern King Counties

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid to upper 40s. Light wind.

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Black Diamond Lake Temperature Statistics

April Temperature

Renton Municipal Airport (16.2 miles)

  • Lowest 1 April, 2026

    43 °F

  • Average April

    48.8 °F

  • Highest 3 April, 2026

    60.1 °F

Climate (2021–Present)

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

    62.3 °F
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