Ontario International Airport Weather Forecast

    • 66
    • 93

    Increasing Clouds

    • 64
    • 83

    Chance Rain Showers

    • 55
    • 76

    Rain Showers Likely

    • 51
    • 67

    Chance Rain Showers

    • 51
    • 71

    Slight Chance Rain Showers

    • 56
    • 76

    Mostly Sunny

Today 9 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 90 to 95. Light Winds becoming west 10 to 15 Mph this afternoon.

Tonight 9 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Clear in the evening. Becoming mostly cloudy. Lows 61 to 66. Areas of Winds west to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ontario International Airport Temperature Statistics

October Temperature

Ontario International Airport (1.2 miles)

  • Lowest 1 October, 2026

    65.6 °F

  • Average October

    86.4 °F

  • Highest 2 October, 2026

    103.6 °F

Climate (2021–2026)

Ontario International Airport (1.2 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    67.2 °F

  • Average High 2021–2026

    79.4 °F
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