Alta Loma Weather Forecast

    • 56
    • 80

    Mostly Sunny

    • 54
    • 78

    Partly Sunny

    • 50
    • 66

    Chance Rain Showers

    • 48
    • 66

    Slight Chance Rain Showers

    • 46
    • 68

    Slight Chance Rain Showers

    • 47
    • 68

    Partly Sunny

Today 8 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 78 to 84. Areas of Winds east to 10 Mph with Gusts to 25 Mph becoming northwest 10 Mph in the afternoon.

Tonight 8 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 46 to 50 in wind Sheltered Areas to 50 to 57 in warmer Locations. Areas of Winds east to 10 Mph in the evening becoming light.

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Alta Loma Temperature Statistics

February Temperature

Ontario International Airport (4.3 miles)

  • Lowest 2 February, 2026

    48.7 °F

  • Average February

    67.7 °F

  • Highest 4 February, 2026

    87.1 °F

Climate (2021–Present)

Ontario International Airport (4.3 miles)

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  • Average Low 2021–2026

    55.6 °F

  • Average 2021–2026

    66.7 °F

  • Average High 2021–2026

    79.1 °F
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