Ontario International Airport Weather Forecast

    • 55
    • 70

    Decreasing Clouds

    • 55
    • 77

    Sunny

    • 57
    • 80

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 56
    • 78

    Partly Sunny

    • 56
    • 76

    Partly Sunny

Today 23 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with a slight chance of Showers. Highs 65 to 71. Light Winds becoming west 10 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 23 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with a slight chance of Showers in the Evening, then mostly clear overnight. Lows 49 to 55. Light Winds. Chance of measurable precipitation 20 percent.

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Ontario International Airport Temperature Statistics

October Temperature

Ontario International Airport (1.2 miles)

  • Lowest 14 October, 2026

    52.6 °F

  • Average October

    78.5 °F

  • Highest 5 October, 2026

    104.6 °F

Climate (2021–2026)

Ontario International Airport (1.2 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    67.3 °F

  • Average High 2021–2026

    79.4 °F
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