Fontana Weather Forecast

    • 52
    • 72

    Sunny

    • 58
    • 81

    Sunny

    • 65
    • 83

    Breezy

    • 63
    • 86

    Sunny

    • 61
    • 85

    Sunny

    • 62
    • 84

    Sunny

    • 56
    • 82

    Mostly Sunny

Today 13 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with a slight chance of Showers. Highs 69 to 75.

Tonight 13 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 47 to 52. Areas of Winds northwest 10 Mph becoming east overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

October Temperature

Ontario International Airport (8.1 miles)

  • Lowest 11 October, 2026

    62.1 °F

  • Average October

    83.2 °F

  • Highest 5 October, 2026

    104.6 °F

Climate (2021–2026)

Ontario International Airport (8.1 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    67.3 °F

  • Average High 2021–2026

    79.4 °F
Get WillyWeather+ to remove ads