Ontario Weather Forecast

    • 42
    • 48

    Chance Rain

    • 45
    • 63

    Mostly Sunny

    • 49
    • 70

    Mostly Cloudy

    • 45
    • 68

    Chance Rain

    • 45
    • 66

    Slight Chance Rain

    • 47
    • 71

    Mostly Sunny

Today 14 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Showers. Highs 48 to 52. Areas of Winds west to 10 Mph becoming east with Gusts to 30 Mph this afternoon.

Tonight 14 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy with a chance of Showers in the Evening, then partly cloudy overnight. Lows 32 to 41. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph. Chance of measurable precipitation 50 percent.

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Ontario Temperature Statistics

March Temperature

Ontario International Airport (3.7 miles)

  • Lowest 8 March, 2025

    39.9 °F

  • Average March

    54.7 °F

  • Highest 9 March, 2025

    75 °F

Climate (2020–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2020–2025

    55.6 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    79.1 °F
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