Grindstone Reservoir Weather Forecast

    • 45
    • 80

    Mostly Sunny

    • 41
    • 78

    Mostly Sunny

    • 38
    • 71

    Mostly Sunny

    • 32
    • 58

    Rain Showers Likely

    • 32
    • 57

    Partly Sunny

    • 36
    • 62

    Mostly Sunny

Today 9 Sep Ochoco-John Day Highlands

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

Tonight 9 Sep Ochoco-John Day Highlands

Mostly clear. Lows in the lower 40s to lower 50s.

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Grindstone Reservoir Temperature Statistics

September Temperature

Burns Municipal Airport (46 miles)

  • Lowest 4 September, 2026

    39.7 °F

  • Average September

    53.8 °F

  • Highest 1 September, 2026

    82.7 °F

Climate (2021–2026)

Burns Municipal Airport (46 miles)

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  • Average Low 2021–2026

    32 °F

  • Average 2021–2026

    47.5 °F

  • Average High 2021–2026

    62.5 °F
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