Rancho Fontana Weather Forecast

    • 55
    • 76

    Sunny

    • 55
    • 80

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

    • 54
    • 81

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

    • 54
    • 75

    Mostly Sunny

Today 16 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Sunny, warmer. Highs 74 to 79. Areas of Winds north to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 16 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 49 to 54. Areas of Winds west 10 Mph becoming east overnight.

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Rancho Fontana Temperature Statistics

October Temperature

Ontario International Airport (7.5 miles)

  • Lowest 14 October, 2025

    54 °F

  • Average October

    67.5 °F

  • Highest 10 October, 2025

    91.9 °F

Climate (2020–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2020–2025

    55.4 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    78.9 °F
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