Alta Loma Weather Forecast

    • 46
    • 56

    Rain Showers

    • 47
    • 59

    Chance Rain Showers

    • 47
    • 64

    Mostly Sunny

    • 47
    • 65

    Mostly Sunny

    • 47
    • 67

    Mostly Sunny

    • 48
    • 67

    Partly Sunny

Today 20 Nov San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy. A chance of Showers this afternoon. Highs 55 to 60. Areas of Winds south 10 Mph. Chance of measurable precipitation 50 percent.

Tonight 20 Nov San Bernardino and Riverside County Valleys-The Inland Empire

Showers. Locally heavy rainfall possible. Lows 43 to 48. Areas of Winds southeast 10 to 15 Mph with Gusts to 25 Mph.

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Alta Loma Temperature Statistics

November Temperature

Ontario International Airport (4.3 miles)

  • Lowest 18 November, 2025

    46.9 °F

  • Average November

    64.2 °F

  • Highest 10 November, 2025

    93 °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

    78.9 °F
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