Copeland Reservoirs Weather Forecast

    • 54
    • 81

    Increasing Clouds

    • 54
    • 82

    Mostly Cloudy

    • 51
    • 80

    Partly Sunny

    • 42
    • 75

    Mostly Sunny

    • 46
    • 75

    Sunny

    • 48
    • 80

    Mostly Sunny

Today 18 Sep Malheur County

Sunny. Highs 80 to 86. Light Winds this Morning, becoming east 10 to 15 Mph this afternoon.

Tonight 18 Sep Malheur County

Mostly cloudy. Lows 52 to 60. North Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Copeland Reservoirs Temperature Statistics

September Temperature

Ontario Municipal Airport (54.1 miles)

  • Lowest 11 September, 2025

    51.1 °F

  • Average September

    70.3 °F

  • Highest 4 September, 2025

    98.1 °F

Climate (2020–Present)

Ontario Municipal Airport (54.1 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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