Olallie State Park Weather Forecast

    • 48
    • 62

    Rain Likely

    • 45
    • 57

    Rain

    • 46
    • 62

    Partly Sunny

    • 48
    • 67

    Mostly Cloudy

    • 47
    • 64

    Partly Sunny

    • 49
    • 66

    Partly Sunny

Today 28 Sep Foothills and Valleys of Central King County

Mostly sunny. Highs in the mid to upper 60s. Light wind.

Tonight 28 Sep Foothills and Valleys of Central King County

Partly cloudy in the Evening, then mostly cloudy with a slight chance of rain after midnight. Lows near 50. South wind to 10 Mph increasing to 10 to 15 Mph after midnight. Gusts to 25 Mph.

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Olallie State Park Temperature Statistics

September Temperature

Stampede Pass (18.6 miles)

  • Lowest 3 September, 2026

    39.9 °F

  • Average September

    51.7 °F

  • Highest 20 September, 2026

    73 °F

Climate (2021–2026)

Stampede Pass (18.6 miles)

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  • Average Low 2021–2026

    36.1 °F

  • Average 2021–2026

    41.5 °F

  • Average High 2021–2026

    48.2 °F
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