Ontario International Airport Weather Forecast

    • 63
    • 87

    Mostly Cloudy

    • 63
    • 86

    Becoming Sunny

    • 64
    • 89

    Mostly Sunny

    • 65
    • 91

    Mostly Sunny

    • 66
    • 92

    Mostly Sunny

    • 67
    • 93

    Mostly Sunny

    • 67
    • 94

    Mostly Sunny

Today 13 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy. Highs 82 to 88. Areas of Winds south to 10 Mph becoming southwest with Gusts to 25 Mph this afternoon.

Tonight 13 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy this evening. Becoming partly cloudy. Patchy dense fog overnight. Lows 57 to 63. Areas of Winds southwest 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Ontario International Airport Temperature Statistics

August Temperature

Ontario International Airport (1.2 miles)

  • Lowest 5 August, 2026

    66.7 °F

  • Average August

    84.1 °F

  • Highest 1 August, 2026

    102.7 °F

Climate (2021–2026)

Ontario International Airport (1.2 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.3 °F
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