Rancho Fontana Weather Forecast

    • 56
    • 79

    Mostly Sunny

    • 57
    • 83

    Mostly Sunny

    • 59
    • 86

    Mostly Sunny

    • 61
    • 88

    Mostly Sunny

    • 61
    • 89

    Mostly Sunny

    • 61
    • 90

    Mostly Sunny

Today 1 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy with patchy fog this morning. Becoming sunny. Highs 77 to 84. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 1 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 49 to 55. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Rancho Fontana Temperature Statistics

July Temperature

Ontario International Airport (7.5 miles)

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Climate (2021–2026)

Ontario International Airport (7.5 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.3 °F
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