Alta Loma Weather Forecast

    • 46
    • 64

    Mostly Cloudy

    • 44
    • 56

    Rain Showers

    • 44
    • 57

    Rain Showers

    • 40
    • 56

    Chance Rain Showers

    • 41
    • 56

    Chance Rain Showers

    • 44
    • 61

    Mostly Sunny

Today 15 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Patchy fog in the morning. Partly cloudy. Highs 63 to 67. Areas of Winds south to 10 Mph becoming southwest with Gusts to 25 Mph in the afternoon.

Tonight 15 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the evening. Becoming mostly cloudy overnight with patchy fog. Lows 39 to 42 in wind Sheltered Areas to 40 to 48 in warmer Locations. Areas of Winds south 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

    63.7 °F

  • Highest 4 February, 2026

    87.7 °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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