Sproul Reservoir Weather Forecast

    • 48
    • 80

    Increasing Clouds

    • 47
    • 79

    Mostly Cloudy

    • 45
    • 76

    Partly Sunny

    • 38
    • 67

    Mostly Sunny

    • 44
    • 73

    Mostly Sunny

    • 45
    • 78

    Partly Sunny

Today 18 Sep Ochoco-John Day Highlands

Sunny. Highs in the upper 70s to mid 80s.

Tonight 18 Sep Ochoco-John Day Highlands

Mostly cloudy. Lows in the mid 40s to lower 50s.

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Sproul Reservoir Temperature Statistics

September Temperature

Grant County Regional Airport (15.5 miles)

  • Lowest 15 September, 2025

    41.9 °F

  • Average September

    67.5 °F

  • Highest 2 September, 2025

    95.9 °F

Climate (2020–Present)

Grant County Regional Airport (15.5 miles)

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  • Average Low 2020–2025

    39.1 °F

  • Average 2020–2025

    50.4 °F

  • Average High 2020–2025

    62.2 °F
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