Ontario International Airport Weather Forecast

    • 45
    • 67

    Mostly Sunny

    • 44
    • 68

    Mostly Sunny

    • 46
    • 69

    Sunny

    • 48
    • 70

    Sunny

    • 50
    • 74

    Mostly Sunny

    • 53
    • 78

    Sunny

Today 3 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming sunny. Highs 63 to 69. Areas of Winds south 10 to 15 Mph becoming north 10 to 20 Mph this afternoon. Gusts to 30 Mph.

Tonight 3 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows around 40 in wind Sheltered Areas to 39 to 45 in warmer Locations. Areas of Winds north 10 to 20 Mph. Gusts to 30 Mph. Becoming 35 Mph overnight.

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Ontario International Airport Temperature Statistics

December Temperature

Ontario International Airport (1.2 miles)

  • Lowest 1 December, 2025

    48.9 °F

  • Average December

    58.6 °F

  • Highest 1 December, 2025

    73 °F

Climate (2020–Present)

Ontario International Airport (1.2 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    78.9 °F
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