Olallie State Park Weather Forecast

    • 31
    • 46

    Increasing Clouds

    • 28
    • 43

    Partly Sunny

    • 27
    • 42

    Sunny

    • 28
    • 44

    Mostly Sunny

    • 31
    • 44

    Partly Sunny

    • 35
    • 46

    Chance Snow

    • 37
    • 49

    Chance Rain/Snow

Today 21 Jan Foothills and Valleys of Central King County

Sunny. Highs near 50. Light wind.

Tonight 21 Jan Foothills and Valleys of Central King County

Partly cloudy until early morning then becoming mostly cloudy. Lows in the lower to mid 30s. Light wind.

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Olallie State Park Temperature Statistics

January Temperature

Stampede Pass (18.6 miles)

  • Lowest 19 January, 2026

    17.1 °F

  • Average January

    30.6 °F

  • Highest 14 January, 2026

    57 °F

Climate (2021–Present)

Stampede Pass (18.6 miles)

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  • Average Low 2021–2026

    36.2 °F

  • Average 2021–2026

    41.5 °F

  • Average High 2021–2026

    48.3 °F
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