Alta Loma Weather Forecast

    • 59
    • 78

    Mostly Sunny

    • 56
    • 78

    Mostly Sunny

    • 56
    • 74

    Mostly Sunny

    • 57
    • 73

    Mostly Cloudy

    • 57
    • 71

    Mostly Cloudy

    • 55
    • 68

    Slight Chance Rain Showers

    • 54
    • 65

    Rain Showers Likely

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

Mostly cloudy in the morning. Becoming partly cloudy. A chance of Showers. Highs 60 to 65.

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

Mostly clear. Lows 54 to 58. Areas of Winds west to 10 Mph this evening becoming light.

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Alta Loma Temperature Statistics

October Temperature

Ontario International Airport (4.3 miles)

  • Lowest 14 October, 2026

    52.6 °F

  • Average October

    76.9 °F

  • Highest 5 October, 2026

    104.6 °F

Climate (2021–2026)

Ontario International Airport (4.3 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    67.3 °F

  • Average High 2021–2026

    79.4 °F
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