Rancho Fontana Weather Forecast

    • 71
    • 100

    Hot

    • 69
    • 99

    Hot

    • 66
    • 95

    Mostly Sunny

    • 62
    • 85

    Partly Sunny

    • 55
    • 77

    Chance Rain Showers

    • 52
    • 71

    Chance Rain Showers

Today 7 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Sunny, hot. Highs 98 to 103. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 7 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 66 to 71. Areas of Winds west 10 to 15 Mph in the evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Rancho Fontana Temperature Statistics

October Temperature

Ontario International Airport (7.5 miles)

  • Lowest 1 October, 2026

    65.6 °F

  • Average October

    85.4 °F

  • Highest 2 October, 2026

    103.6 °F

Climate (2021–2026)

Ontario International Airport (7.5 miles)

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

  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.2 °F

  • Average High 2021–2026

    79.4 °F
Get WillyWeather+ to remove ads