Winthrop Weather Forecast

    • 41
    • 63

    Rain Showers

    • 45
    • 77

    Mostly Sunny

    • 47
    • 83

    Mostly Sunny

    • 47
    • 83

    Mostly Sunny

    • 47
    • 81

    Mostly Sunny

    • 47
    • 81

    Mostly Sunny

Today 15 Sep Western Okanogan County

Rain Showers. Patchy fog. Highs in the upper 50s to mid 60s. Chance of precipitation near 100 percent. Rainfall Amounts less than a quarter of an inch.

Tonight 15 Sep Western Okanogan County

Partly cloudy. Lows in the 40s.

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Winthrop Temperature Statistics

September Temperature

Omak Airport (30.4 miles)

  • Lowest 6 September, 2026

    46.7 °F

  • Average September

    64.9 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Omak Airport (30.4 miles)

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  • Average Low 2021–2026

    40.7 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    62.9 °F
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