Fontana Weather Forecast

    • 56
    • 80

    Increasing Clouds

    • 56
    • 77

    Mostly Sunny

    • 60
    • 83

    Mostly Sunny

    • 62
    • 89

    Mostly Sunny

    • 61
    • 88

    Mostly Sunny

    • 59
    • 86

    Mostly Sunny

    • 59
    • 86

    Mostly Sunny

Today 25 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 78 to 83. Light Winds becoming west 10 Mph this afternoon.

Tonight 25 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear this evening. Becoming partly cloudy. Patchy fog overnight. Lows 50 to 56. Areas of Winds west to 10 Mph this evening becoming light.

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Fontana Temperature Statistics

October Temperature

Ontario International Airport (8.1 miles)

  • Lowest 16 October, 2025

    53.1 °F

  • Average October

    67.4 °F

  • Highest 10 October, 2025

    91.9 °F

Climate (2020–Present)

Ontario International Airport (8.1 miles)

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  • Average Low 2020–2025

    55.4 °F

  • Average 2020–2025

    66.5 °F

  • Average High 2020–2025

    78.9 °F
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