Stewart Lake Weather Forecast

    • 50
    • 68

    Slight Chance Rain Showers

    • 51
    • 73

    Mostly Sunny

    • 56
    • 75

    Mostly Sunny

    • 48
    • 74

    Partly Sunny

    • 48
    • 66

    Partly Sunny

    • 47
    • 60

    Partly Sunny

    • 48
    • 65

    Mostly Sunny

Today 7 Sep Okanogan Valley

Mostly cloudy. Highs in the upper 60s to mid 70s.

Tonight 7 Sep Okanogan Valley

Mostly cloudy. A chance of rain Showers in the evening. Lows in the lower 50s. Chance of precipitation 20 percent.

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Stewart Lake Temperature Statistics

September Temperature

Omak Airport (13.7 miles)

  • Lowest 5 September, 2026

    48.9 °F

  • Average September

    64.4 °F

  • Highest 1 September, 2026

    83.6 °F

Climate (2021–2026)

Omak Airport (13.7 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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