Ontario International Airport Weather Forecast

    • 76
    • 103

    Hot

    • 73
    • 104

    Hot

    • 70
    • 100

    Hot

    • 66
    • 96

    Sunny

    • 64
    • 91

    Mostly Sunny

    • 66
    • 88

    Chance Rain Showers

    • 67
    • 90

    Slight Chance Rain Showers

Today 27 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 102 to 107. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 27 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Lows 71 to 76. Areas of Winds west to 10 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ontario International Airport Temperature Statistics

August Temperature

Ontario International Airport (1.2 miles)

  • Lowest 15 August, 2026

    65.6 °F

  • Average August

    84.4 °F

  • Highest 23 August, 2026

    105.7 °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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