Ontario International Airport Weather Forecast

    • 58
    • 79

    Increasing Clouds

    • 57
    • 80

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

    • 58
    • 80

    Mostly Sunny

    • 59
    • 87

    Sunny

    • 62
    • 91

    Sunny

    • 63
    • 93

    Sunny

Today 18 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog this morning. Becoming sunny. Highs 78 to 85. Areas of Winds south to 10 Mph becoming west with Gusts to 25 Mph this afternoon.

Tonight 18 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Lows 51 to 57. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ontario International Airport Temperature Statistics

June Temperature

Ontario International Airport (1.2 miles)

  • Lowest 1 June, 2026

    58.6 °F

  • Average June

    75.4 °F

  • Highest 12 June, 2026

    99.6 °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

    79.4 °F
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