Mays Reservoir Weather Forecast

    • 55
    • 82

    Mostly Sunny

    • 56
    • 85

    Mostly Sunny

    • 56
    • 83

    Sunny

    • 60
    • 88

    Sunny

    • 64
    • 94

    Mostly Sunny

    • 64
    • 94

    Mostly Sunny

Today 18 Aug John Day Basin

Sunny. Highs in the 80s. Light Wind, becoming northwest 5 to 10 Mph in the afternoon.

Tonight 18 Aug John Day Basin

Mostly clear. Lows in the lower to mid 50s. Northwest wind 5 to 10 Mph in the Evening, becoming light.

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Mays Reservoir Temperature Statistics

August Temperature

Prineville Airport (37.3 miles)

  • Lowest 8 August, 2025

    35.6 °F

  • Average August

    69.1 °F

  • Highest 11 August, 2025

    98.6 °F

Climate (2020–Present)

Prineville Airport (37.3 miles)

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  • Average Low 2020–2025

    34.2 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    62.8 °F
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