Winthrop Weather Forecast

    • 49
    • 84

    Mostly Sunny

    • 49
    • 87

    Mostly Sunny

    • 48
    • 84

    Chance Rain Showers

    • 39
    • 70

    Mostly Sunny

    • 44
    • 74

    Mostly Sunny

    • 49
    • 80

    Partly Sunny

Today 18 Sep Western Okanogan County

Partly cloudy. Haze. Highs in the upper 70s to mid 80s.

Tonight 18 Sep Western Okanogan County

Mostly clear. Haze overnight. Lows in the upper 40s to upper 50s.

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Winthrop Temperature Statistics

September Temperature

Omak Airport (30.4 miles)

  • Lowest 16 September, 2025

    51.1 °F

  • Average September

    74 °F

  • Highest 3 September, 2025

    104 °F

Climate (2020–Present)

Omak Airport (30.4 miles)

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  • Average Low 2020–2025

    40.7 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    62.7 °F
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