Ontario International Airport Weather Forecast

    • 54
    • 87

    Increasing Clouds

    • 52
    • 74

    Partly Sunny

    • 52
    • 69

    Mostly Cloudy

    • 49
    • 69

    Patchy Fog

    • 49
    • 69

    Patchy Fog

    • 51
    • 70

    Mostly Cloudy

    • 51
    • 71

    Partly Sunny

Today 25 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 87 to 91. Areas of Winds east to 10 Mph becoming west with Gusts to 25 Mph this afternoon.

Tonight 25 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Cooler. Lows around 50 in wind Sheltered Areas to 49 to 55 in warmer Locations. Areas of Winds west to 10 Mph this evening becoming light.

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Ontario International Airport Temperature Statistics

March Temperature

Ontario International Airport (1.2 miles)

  • Lowest 8 March, 2025

    39.9 °F

  • Average March

    56 °F

  • Highest 21 March, 2025

    78.1 °F

Climate (2020–Present)

Ontario International Airport (1.2 miles)

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  • Average Low 2020–2025

    55.6 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    79.2 °F
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