Alta Loma Weather Forecast

    • 52
    • 72

    Chance Rain Showers

    • 52
    • 71

    Partly Sunny

    • 52
    • 70

    Partly Sunny

    • 56
    • 77

    Partly Sunny

    • 57
    • 83

    Mostly Sunny

    • 58
    • 86

    Mostly Sunny

Today 31 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy this morning. Becoming cloudy. Patchy fog this morning. Highs 70 to 75. Areas of Winds south to 10 Mph becoming west with Gusts to 25 Mph this afternoon.

Tonight 31 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy. A chance of Showers in the evening. Lows around 50 in wind Sheltered Areas to 48 to 55 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph. Becoming to 10 Mph overnight. Chance of measurable precipitation 50 percent.

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Alta Loma Temperature Statistics

March Temperature

Ontario International Airport (4.3 miles)

  • Lowest 6 March, 2026

    50.6 °F

  • Average March

    71.6 °F

  • Highest 19 March, 2026

    100.7 °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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