New Plymouth Weather Forecast

    • 42
    • 72

    Mostly Sunny

    • 48
    • 77

    Partly Sunny

    • 49
    • 82

    Mostly Sunny

    • 48
    • 80

    Chance Rain Showers

    • 45
    • 77

    Mostly Sunny

    • 46
    • 80

    Mostly Sunny

Today 14 Sep Lower Treasure Valley

Areas of fog this morning. Sunny. Highs 68 to 73. West Winds up to 10 Mph.

Tonight 14 Sep Lower Treasure Valley

Mostly clear. Lows 41 to 46. North Winds up to 10 Mph in the Evening, becoming light after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

New Plymouth Temperature Statistics

September Temperature

Ontario Municipal Airport (9.3 miles)

  • Lowest 5 September, 2026

    42.7 °F

  • Average September

    62.7 °F

  • Highest 10 September, 2026

    88.6 °F

Climate (2021–2026)

Ontario Municipal Airport (9.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    67.1 °F
Get WillyWeather+ to remove ads