Olallie State Park Weather Forecast

    • 51
    • 67

    Chance Rain

    • 51
    • 68

    Mostly Cloudy

    • 50
    • 69

    Mostly Cloudy

    • 51
    • 71

    Partly Sunny

    • 49
    • 70

    Mostly Sunny

    • 54
    • 76

    Mostly Sunny

Today 16 Aug Foothills and Valleys of Central King County

Partly sunny. A chance of rain in the morning. A slight chance of rain in the late morning and early Afternoon, then a chance of rain late in the afternoon. Highs in the 70s. South wind to 10 Mph with Gusts to 20 Mph becoming southwest around 10 Mph in the afternoon.

Tonight 16 Aug Foothills and Valleys of Central King County

Mostly cloudy. A chance of rain in the Evening, then a slight chance of rain after midnight. Patchy fog in the morning. Lows in the mid to upper 50s. Southwest wind to 10 Mph becoming south after midnight.

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Olallie State Park Temperature Statistics

August Temperature

Stampede Pass (18.6 miles)

  • Lowest 8 August, 2025

    43 °F

  • Average August

    57.7 °F

  • Highest 11 August, 2025

    84 °F

Climate (2020–Present)

Stampede Pass (18.6 miles)

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  • Average Low 2020–2025

    36.2 °F

  • Average 2020–2025

    41.5 °F

  • Average High 2020–2025

    48.3 °F
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