Mann Creek Reservoir Weather Forecast

    • 59
    • 81

    Increasing Clouds

    • 55
    • 77

    Mostly Sunny

    • 49
    • 79

    Rain Showers Likely

    • 45
    • 64

    Partly Sunny

    • 46
    • 65

    Mostly Sunny

    • 49
    • 69

    Mostly Sunny

    • 52
    • 74

    Mostly Sunny

Today 10 Sep Lower Treasure Valley

Mostly sunny. Highs 84 to 89. Light Winds.

Tonight 10 Sep Lower Treasure Valley

Decreasing Clouds. Lows 54 to 60. Southeast Winds up to 10 Mph this Evening, shifting to northwest after midnight.

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Mann Creek Reservoir Temperature Statistics

September Temperature

Ontario Municipal Airport (26.7 miles)

  • Lowest 5 September, 2026

    42.7 °F

  • Average September

    60.7 °F

  • Highest 1 September, 2026

    83.6 °F

Climate (2021–2026)

Ontario Municipal Airport (26.7 miles)

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  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    67.1 °F
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