Threemile Reservoir Weather Forecast

    • 37
    • 62

    Decreasing Clouds

    • 43
    • 69

    Mostly Sunny

    • 46
    • 74

    Partly Sunny

    • 47
    • 77

    Mostly Sunny

    • 48
    • 79

    Mostly Sunny

    • 50
    • 82

    Mostly Sunny

    • 48
    • 84

    Mostly Sunny

Today 18 May Harney County

Mostly sunny. Highs 59 to 64. Northwest Winds up to 10 Mph with Gusts to 20 Mph.

Tonight 18 May Harney County

Partly cloudy this Evening, then clearing. Lows 31 to 38. North Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

May Temperature

Rome (53.4 miles)

  • Lowest 1 May, 2026

    30.7 °F

  • Average May

    60.2 °F

  • Highest 12 May, 2026

    95.6 °F

Climate (2021–Present)

Rome (53.4 miles)

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  • Average Low 2021–2026

    36.8 °F

  • Average 2021–2026

    51.6 °F

  • Average High 2021–2026

    66.2 °F
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