Ontario Weather Forecast

    • 46
    • 66

    Mostly Sunny

    • 48
    • 70

    Partly Sunny

    • 50
    • 75

    Partly Sunny

    • 52
    • 79

    Mostly Sunny

    • 52
    • 77

    Mostly Sunny

    • 49
    • 74

    Mostly Sunny

    • 43
    • 65

    Partly Sunny

Today 2 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 65 to 69. Areas of Winds southeast to 10 Mph becoming west this afternoon.

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Ontario Temperature Statistics

December Temperature

Ontario International Airport (3.7 miles)

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Climate (2018–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2018–2023

    56 °F

  • Average 2018–2023

    66.5 °F

  • Average High 2018–2023

    79.2 °F
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