Chief Joseph State Park Weather Forecast

    • 50
    • 77

    Increasing Clouds

    • 55
    • 75

    Rain Showers

    • 46
    • 69

    Rain Showers

    • 45
    • 67

    Partly Sunny

    • 45
    • 67

    Partly Sunny

    • 46
    • 68

    Partly Sunny

Today 23 Sep Okanogan Valley

Partly cloudy in the Morning, becoming mostly cloudy. Highs in the upper 60s to mid 70s.

Tonight 23 Sep Okanogan Valley

Mostly cloudy. Lows in the upper 40s to lower 50s.

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Chief Joseph State Park Temperature Statistics

September Temperature

Omak Airport (27.3 miles)

  • Lowest 14 September, 2026

    44.7 °F

  • Average September

    64.4 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Omak Airport (27.3 miles)

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  • Average Low 2021–2026

    40.8 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    62.9 °F
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