Mays Reservoir Weather Forecast

    • 57
    • 87

    Sunny

    • 58
    • 89

    Sunny

    • 63
    • 91

    Partly Sunny

    • 65
    • 90

    Mostly Cloudy

    • 64
    • 92

    Partly Sunny

    • 64
    • 91

    Slight Chance Rain Showers

Today 17 Jul John Day Basin

Sunny. Highs in the upper 80s to mid 90s. Light Wind, becoming northwest 5 to 10 Mph in the afternoon.

Tonight 17 Jul John Day Basin

Clear. Lows in the mid to upper 50s. Northwest wind 5 to 15 Mph in the Evening, becoming light.

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  • Temperature Real-Time

Mays Reservoir Temperature Statistics

July Temperature

Prineville Airport (37.3 miles)

  • Lowest 2 July, 2026

    33.8 °F

  • Average July

    69.2 °F

  • Highest 7 July, 2026

    93.2 °F

Climate (2021–2026)

Prineville Airport (37.3 miles)

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  • Average Low 2021–2026

    34.6 °F

  • Average 2021–2026

    49.6 °F

  • Average High 2021–2026

    63 °F
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