Alta Loma Weather Forecast

    • 51
    • 71

    Sunny

    • 52
    • 74

    Partly Sunny

    • 49
    • 71

    Partly Sunny

    • 53
    • 77

    Mostly Sunny

    • 55
    • 80

    Partly Sunny

    • 53
    • 81

    Mostly Sunny

Today 14 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Warmer. Highs 69 to 74. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 14 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 44 to 51. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Alta Loma Temperature Statistics

April Temperature

Ontario International Airport (4.3 miles)

  • Lowest 3 April, 2026

    50.6 °F

  • Average April

    68.3 °F

  • Highest 4 April, 2026

    89.7 °F

Climate (2021–Present)

Ontario International Airport (4.3 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.4 °F
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