Alta Loma Weather Forecast

    • 49
    • 61

    Rain Showers

    • 44
    • 57

    Rain Showers

    • 41
    • 57

    Mostly Sunny

    • 45
    • 62

    Mostly Sunny

    • 46
    • 64

    Mostly Sunny

    • 48
    • 69

    Mostly Sunny

    • 49
    • 69

    Chance Rain Showers

Today 25 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with a chance of Showers. Highs 60 to 66. Areas of Winds south 10 to 15 Mph. Gusts to 25 Mph. Becoming 30 Mph this afternoon. Chance of measurable precipitation 50 percent.

Tonight 25 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. A chance of Showers. Lows 43 to 51. Areas of Winds southeast 10 Mph. Chance of measurable precipitation 50 percent.

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Alta Loma Temperature Statistics

December Temperature

Ontario International Airport (4.3 miles)

  • Lowest 20 December, 2025

    45 °F

  • Average December

    61.1 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Ontario International Airport (4.3 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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