Cougar Mountain Weather Forecast

    • 46
    • 54

    Rain Showers Likely

    • 43
    • 59

    Partly Sunny

    • 46
    • 63

    Mostly Sunny

    • 53
    • 71

    Mostly Sunny

    • 58
    • 81

    Partly Sunny

    • 53
    • 72

    Mostly Cloudy

Today 29 May Foothills and Valleys of Central King County

Showers until late Afternoon, then cloudy with a slight chance of Showers late in the afternoon. Rainfall Amounts less than a tenth of an inch likely. Highs near 60. North wind to 10 Mph becoming northeast in the Afternoon, Gusts to 20 Mph in the morning.

Tonight 29 May Foothills and Valleys of Central King County

Mostly cloudy. A slight chance of Showers in the evening. Lows in the 40s. Light wind.

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  • Temperature Forecast NOAA

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Cougar Mountain Temperature Statistics

May Temperature

Renton Municipal Airport (5.6 miles)

  • Lowest 17 May, 2026

    43 °F

  • Average May

    59.5 °F

  • Highest 12 May, 2026

    82 °F

Climate (2021–Present)

Renton Municipal Airport (5.6 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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