Collins Reservoir Weather Forecast

    • 54
    • 80

    Increasing Clouds

    • 55
    • 80

    Mostly Cloudy

    • 51
    • 78

    Partly Sunny

    • 46
    • 71

    Mostly Sunny

    • 52
    • 78

    Mostly Sunny

    • 52
    • 80

    Chance Rain Showers

Today 18 Sep Ochoco-John Day Highlands

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

Tonight 18 Sep Ochoco-John Day Highlands

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

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  • Temperature Real-Time

Collins Reservoir Temperature Statistics

September Temperature

Prineville Airport (47.8 miles)

  • Lowest 15 September, 2025

    33.8 °F

  • Average September

    66.3 °F

  • Highest 2 September, 2025

    96.8 °F

Climate (2020–Present)

Prineville Airport (47.8 miles)

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  • Average Low 2020–2025

    34.3 °F

  • Average 2020–2025

    49.4 °F

  • Average High 2020–2025

    62.8 °F
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