Winthrop Weather Forecast

    • 34
    • 66

    Decreasing Clouds

    • 41
    • 69

    Partly Sunny

    • 42
    • 64

    Chance Rain Showers

    • 39
    • 68

    Mostly Cloudy

    • 40
    • 69

    Mostly Cloudy

    • 39
    • 70

    Partly Sunny

Today 27 Sep Western Okanogan County

Mostly cloudy in the morning then clearing. Widespread frost in the morning. Highs in the 60s.

Tonight 27 Sep Western Okanogan County

Mostly clear. Lows in the mid 30s to lower 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Winthrop Temperature Statistics

September Temperature

Omak Airport (30.4 miles)

  • Lowest 14 September, 2026

    44.7 °F

  • Average September

    64 °F

  • Highest 21 September, 2026

    86.6 °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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