Fontana Weather Forecast

    • 67
    • 88

    Mostly Sunny

    • 64
    • 86

    Partly Sunny

    • 64
    • 85

    Mostly Sunny

    • 60
    • 82

    Mostly Sunny

    • 58
    • 73

    Rain Showers Likely

    • 56
    • 67

    Rain Showers Likely

    • 54
    • 65

    Chance Rain Showers

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

Partly cloudy in the morning. Becoming mostly sunny. Highs 65 to 70.

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

Mostly clear. Lows 63 to 68. Areas of Winds east 20 to 30 Mph. Gusts to 50 Mph. Becoming 45 Mph overnight.

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Fontana Temperature Statistics

October Temperature

Ontario International Airport (8.1 miles)

  • Lowest 13 October, 2026

    53.1 °F

  • Average October

    79.2 °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

    79.4 °F
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