Ontario Weather Forecast

    • 46
    • 75

    Mostly Sunny

    • 47
    • 77

    Mostly Sunny

    • 49
    • 78

    Slight Chance Rain Showers

    • 42
    • 65

    Chance Rain Showers

    • 42
    • 58

    Chance Rain Showers

    • 41
    • 59

    Chance Rain Showers

    • 39
    • 59

    Chance Rain Showers

Today 8 Oct Oregon Lower Treasure Valley

Sunny. Highs 73 to 78. East Winds 10 to 15 Mph.

Tonight 8 Oct Oregon Lower Treasure Valley

Mostly clear. Lows 43 to 48. Northeast Winds up to 10 Mph.

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Ontario Temperature Statistics

October Temperature

Ontario Municipal Airport (1.9 miles)

  • Lowest 6 October, 2025

    37.9 °F

  • Average October

    58.1 °F

  • Highest 1 October, 2025

    73.9 °F

Climate (2020–Present)

Ontario Municipal Airport (1.9 miles)

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  • Average Low 2020–2025

    42.6 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    67 °F
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