Barton Reservoir Weather Forecast

    • 63
    • 94

    Mostly Sunny

    • 61
    • 89

    Chance Thunderstorms

    • 59
    • 88

    Partly Sunny

    • 57
    • 86

    Partly Sunny

    • 55
    • 77

    Chance Rain Showers

    • 52
    • 72

    Chance Rain Showers

Today 5 Sep Lower Treasure Valley

Sunny. Smoke this Morning, then Areas of smoke this afternoon. Highs 90 to 95. Southeast Winds 10 to 15 Mph.

Tonight 5 Sep Lower Treasure Valley

Mostly clear. Areas of smoke. Lows 61 to 66. Southwest Winds up to 10 Mph with Gusts to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Barton Reservoir Temperature Statistics

September Temperature

Ontario Municipal Airport (21.7 miles)

  • Lowest 1 September, 2025

    57 °F

  • Average September

    75.5 °F

  • Highest 2 September, 2025

    95 °F

Climate (2020–Present)

Ontario Municipal Airport (21.7 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    67.1 °F
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