Fontana Weather Forecast

    • 62
    • 85

    Chance Rain Showers

    • 54
    • 70

    Rain Showers

    • 49
    • 63

    Rain Showers Likely

    • 51
    • 69

    Mostly Sunny

    • 56
    • 77

    Sunny

    • 60
    • 81

    Sunny

Today 10 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 84 to 91.

Tonight 10 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Cloudy. A chance of Showers this Evening, then Showers overnight. Locally heavy rainfall possible overnight. Cooler. Lows 56 to 62. Areas of Winds west to 10 Mph becoming north with Gusts to 25 Mph overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

October Temperature

Ontario International Airport (8.1 miles)

  • Lowest 1 October, 2026

    65.6 °F

  • Average October

    86.6 °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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