Owyhee Weather Forecast

    • 56
    • 86

    Increasing Clouds

    • 56
    • 86

    Mostly Cloudy

    • 56
    • 85

    Partly Sunny

    • 47
    • 81

    Mostly Sunny

    • 48
    • 78

    Sunny

    • 51
    • 83

    Mostly Sunny

Today 18 Sep Oregon Lower Treasure Valley

Sunny. Highs 83 to 88. Light Winds this Morning, becoming east up to 10 Mph this afternoon.

Tonight 18 Sep Oregon Lower Treasure Valley

Increasing Clouds. Lows 53 to 61. Northwest Winds up to 10 Mph.

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Owyhee Temperature Statistics

September Temperature

Ontario Municipal Airport (14.9 miles)

  • Lowest 16 September, 2025

    46 °F

  • Average September

    69.8 °F

  • Highest 4 September, 2025

    98.1 °F

Climate (2020–Present)

Ontario Municipal Airport (14.9 miles)

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  • Average Low 2020–2025

    42.6 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    67.1 °F
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