Alta Loma Weather Forecast

    • 52
    • 77

    Becoming Sunny

    • 49
    • 72

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

    • 47
    • 66

    Mostly Sunny

    • 47
    • 68

    Mostly Sunny

    • 46
    • 67

    Mostly Sunny

Today 27 Nov San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy this morning. Becoming partly cloudy. Highs 77 to 81. Areas of Winds east 10 to 15 Mph with Gusts to 30 Mph becoming north with Gusts to 25 Mph this afternoon.

Tonight 27 Nov San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the evening. Becoming mostly clear. Lows 46 to 49 in wind Sheltered Areas to 49 to 54 in warmer Locations. Areas of Winds east 10 Mph in the evening becoming light.

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Alta Loma Temperature Statistics

November Temperature

Ontario International Airport (4.3 miles)

  • Lowest 19 November, 2025

    45 °F

  • Average November

    62.4 °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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