New Plymouth Weather Forecast

    • 56
    • 85

    Increasing Clouds

    • 55
    • 86

    Mostly Cloudy

    • 55
    • 84

    Partly Sunny

    • 47
    • 79

    Mostly Sunny

    • 48
    • 77

    Mostly Sunny

    • 51
    • 83

    Partly Sunny

Today 18 Sep Lower Treasure Valley

Sunny. Highs 83 to 88. East Winds up to 10 Mph with Gusts to 20 Mph.

Tonight 18 Sep Lower Treasure Valley

Increasing Clouds. Lows 54 to 60. Light Winds.

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New Plymouth Temperature Statistics

September Temperature

Ontario Municipal Airport (9.3 miles)

  • Lowest 16 September, 2025

    46 °F

  • Average September

    69.8 °F

  • Highest 4 September, 2025

    98.1 °F

Climate (2020–Present)

Ontario Municipal Airport (9.3 miles)

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  • Average Low 2020–2025

    42.6 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    67.1 °F
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