Ontario International Airport Weather Forecast

    • 56
    • 83

    Sunny

    • 54
    • 82

    Sunny

    • 52
    • 79

    Mostly Sunny

    • 51
    • 77

    Partly Sunny

    • 50
    • 76

    Mostly Sunny

    • 51
    • 75

    Mostly Sunny

Today 10 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 82 to 87. Areas of Winds north 10 to 15 Mph. Gusts to 30 Mph. Becoming 35 Mph this afternoon.

Tonight 10 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 48 to 52 in wind Sheltered Areas to 53 to 59 in warmer Locations. Areas of Winds east 10 to 15 Mph. Gusts to 25 Mph in the evening.

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Ontario International Airport Temperature Statistics

December Temperature

Ontario International Airport (1.2 miles)

  • Lowest 2 December, 2025

    46 °F

  • Average December

    59.1 °F

  • Highest 8 December, 2025

    81 °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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