Black Diamond Lake Weather Forecast

    • 43
    • 64

    Partly Cloudy

    • 43
    • 67

    Partly Sunny

    • 41
    • 59

    Mostly Cloudy

    • 37
    • 56

    Mostly Cloudy

    • 40
    • 54

    Mostly Cloudy

    • 40
    • 57

    Slight Chance Rain

Today 20 Oct Foothills and Valleys of Pierce and Southern King Counties

Mostly sunny. Patchy frost in the morning. Patchy fog in the morning. Highs in the lower to mid 60s. Light wind.

Tonight 20 Oct Foothills and Valleys of Pierce and Southern King Counties

Mostly clear in the evening then becoming mostly cloudy. Patchy fog in the morning. Lows in the upper 30s to mid 40s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Black Diamond Lake Temperature Statistics

October Temperature

Renton Municipal Airport (16.2 miles)

  • Lowest 12 October, 2026

    39.9 °F

  • Average October

    56.9 °F

  • Highest 16 October, 2026

    75.9 °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

    62.3 °F
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