California Motor Speedway Weather Forecast

    • 44
    • 59

    Rain Showers

    • 41
    • 58

    Mostly Sunny

    • 44
    • 62

    Breezy

    • 45
    • 63

    Mostly Sunny

    • 46
    • 67

    Partly Sunny

    • 48
    • 67

    Chance Rain Showers

Today 26 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Showers likely this Morning, then Showers and a slight chance of Thunderstorms this afternoon. Locally heavy rainfall possible this afternoon. Highs 57 to 62. Areas of Winds south 10 to 15 Mph with Gusts to 30 Mph.

Tonight 26 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy with Showers likely and a slight chance of Thunderstorms in the Evening, then partly cloudy with a chance of Showers overnight. Colder. Lows 39 to 44. Areas of Winds west to 10 Mph. Chance of measurable precipitation 70 percent.

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California Motor Speedway Temperature Statistics

December Temperature

Ontario International Airport (5 miles)

  • Lowest 20 December, 2025

    45 °F

  • Average December

    61 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Ontario International Airport (5 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    79 °F
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