Alta Loma Weather Forecast

    • 56
    • 78

    Patchy Fog

    • 55
    • 74

    Partly Sunny

    • 55
    • 76

    Patchy Fog

    • 55
    • 77

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 59
    • 84

    Mostly Sunny

Today 27 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog this morning. Becoming sunny. Highs 77 to 84. Areas of Winds south to 10 Mph. Becoming southwest 10 to 20 Mph with Gusts to 30 Mph this afternoon.

Tonight 27 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Lows 51 to 57. Areas of Winds south 10 to 15 Mph. Gusts to 30 Mph this evening.

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Alta Loma Temperature Statistics

June Temperature

Ontario International Airport (4.3 miles)

  • Lowest 21 June, 2026

    56.6 °F

  • Average June

    74.5 °F

  • Highest 12 June, 2026

    99.6 °F

Climate (2021–2026)

Ontario International Airport (4.3 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.3 °F
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