Cougar Mountain Weather Forecast

    • 47
    • 50

    Chance Rain

    • 42
    • 56

    Mostly Cloudy

    • 40
    • 49

    Mostly Cloudy

    • 36
    • 48

    Partly Sunny

    • 36
    • 50

    Mostly Sunny

    • 36
    • 51

    Mostly Sunny

    • 35
    • 49

    Partly Sunny

Today 12 Jan Foothills and Valleys of Central King County

Cloudy with rain likely in the Morning, then cloudy with a chance of rain in the afternoon. Rainfall Amounts less than a tenth of an inch likely. Highs in the lower to mid 50s. Southeast wind to 10 Mph becoming south in the afternoon.

Tonight 12 Jan Foothills and Valleys of Central King County

Mostly cloudy. A slight chance of rain in the evening. Patchy fog late in the night. Lows near 50. Southeast wind to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cougar Mountain Temperature Statistics

January Temperature

Renton Municipal Airport (5.6 miles)

  • Lowest 1 January, 2026

    33.1 °F

  • Average January

    43.8 °F

  • Highest 3 January, 2026

    55 °F

Climate (2021–Present)

Renton Municipal Airport (5.6 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    62.2 °F
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