Cougar Mountain Weather Forecast

    • 51
    • 68

    Rain

    • 50
    • 65

    Rain Likely

    • 50
    • 66

    Mostly Cloudy

    • 52
    • 70

    Partly Sunny

    • 53
    • 70

    Chance Rain

    • 50
    • 62

    Rain

    • 49
    • 64

    Chance Rain

Today 28 Aug Foothills and Valleys of Central King County

Cloudy in the morning then becoming mostly sunny. Highs in the lower 70s. Light wind.

Tonight 28 Aug Foothills and Valleys of Central King County

Partly cloudy in the Evening, then cloudy with a chance of rain after midnight. Cloudy with rain likely late in the night. Patchy fog after midnight. Rainfall Amounts a tenth to a quarter of an inch possible. Lows in the upper 40s to mid 50s. Light wind.

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Cougar Mountain Temperature Statistics

August Temperature

Renton Municipal Airport (5.6 miles)

  • Lowest 3 August, 2026

    52 °F

  • Average August

    68.6 °F

  • Highest 6 August, 2026

    87.1 °F

Climate (2021–2026)

Renton Municipal Airport (5.6 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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