Ontario International Airport Weather Forecast

    • 50
    • 73

    Chance Rain Showers

    • 50
    • 71

    Partly Sunny

    • 53
    • 77

    Mostly Sunny

    • 54
    • 75

    Partly Sunny

    • 52
    • 68

    Mostly Cloudy

    • 52
    • 69

    Partly Sunny

Today 21 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny this Morning, then partly cloudy with a slight chance of Showers this afternoon. Highs 71 to 76. Areas of Winds south to 10 Mph. Becoming southwest 10 to 20 Mph with Gusts to 35 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 21 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy. A chance of Showers this evening. Patchy fog overnight. Lows 44 to 50. Areas of Winds west 10 to 15 Mph. Gusts to 30 Mph this evening. Chance of measurable precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ontario International Airport Temperature Statistics

April Temperature

Ontario International Airport (1.2 miles)

  • Lowest 13 April, 2026

    49.6 °F

  • Average April

    67.3 °F

  • Highest 4 April, 2026

    89.7 °F

Climate (2021–Present)

Ontario International Airport (1.2 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.4 °F
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