Winthrop Weather Forecast

    • 47
    • 72

    Slight Chance Thunderstorms

    • 49
    • 75

    Partly Sunny

    • 46
    • 75

    Partly Sunny

    • 48
    • 79

    Mostly Sunny

    • 51
    • 83

    Mostly Sunny

    • 49
    • 83

    Partly Sunny

    • 47
    • 77

    Partly Sunny

Today 5 Sep Western Okanogan County

Sunny in the Morning, then mostly cloudy with a chance of Showers and Thunderstorms in the afternoon. Highs in the upper 60s to lower 70s. Chance of precipitation 50 percent.

Tonight 5 Sep Western Okanogan County

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly clear with a chance of rain Showers overnight. Lows in the mid 40s to lower 50s. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an Inch, except higher Amounts possible in Thunderstorms.

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Winthrop Temperature Statistics

September Temperature

Omak Airport (30.4 miles)

  • Lowest 1 September, 2026

    50.6 °F

  • Average September

    64.9 °F

  • Highest 1 September, 2026

    83.6 °F

Climate (2021–2026)

Omak Airport (30.4 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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