Alta Loma Weather Forecast

    • 70
    • 94

    Mostly Sunny

    • 72
    • 96

    Mostly Sunny

    • 72
    • 99

    Hot

    • 73
    • 98

    Hot

    • 72
    • 99

    Hot

    • 65
    • 95

    Mostly Sunny

    • 62
    • 88

    Mostly Sunny

Today 24 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs in the mid 90s. Light Winds becoming west 15 Mph with Gusts to 25 Mph this afternoon.

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Alta Loma Temperature Statistics

September Temperature

Ontario International Airport (4.3 miles)

  • Lowest 19 September, 2022

    60.1 °F

  • Average September

    79.3 °F

  • Highest 4 September, 2022

    108 °F

Climate (2010–Present)

Ontario International Airport (4.3 miles)

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  • Average Low 2010–Present

    56.9 °F

  • Average 2010–Present

    67.3 °F

  • Average High 2010–Present

    80.4 °F
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