Fontana Weather Forecast

    • 59
    • 73

    Increasing Clouds

    • 58
    • 69

    Mostly Cloudy

    • 58
    • 70

    Rain Showers

    • 56
    • 67

    Rain Showers Likely

    • 57
    • 73

    Mostly Sunny

    • 56
    • 74

    Mostly Sunny

Today 29 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 71 to 75. Light Winds becoming southwest to 10 Mph in the afternoon.

Tonight 29 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy. A slight chance of Showers overnight. Lows 53 to 58. Areas of Winds southwest 10 Mph in the evening becoming light. Chance of measurable precipitation 20 percent.

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Fontana Temperature Statistics

October Temperature

Ontario International Airport (8.1 miles)

  • Lowest 14 October, 2026

    52.6 °F

  • Average October

    76 °F

  • Highest 5 October, 2026

    104.6 °F

Climate (2021–2026)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    67.3 °F

  • Average High 2021–2026

    79.5 °F
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