Rancho Fontana Weather Forecast

    • 63
    • 92

    Areas Smoke

    • 62
    • 88

    Mostly Sunny

    • 62
    • 87

    Slight Chance Thunderstorms

    • 59
    • 83

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 55
    • 78

    Partly Sunny

    • 56
    • 77

    Mostly Sunny

Today 23 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Haze in the afternoon. Highs 91 to 96. Light Winds becoming west 15 Mph with Gusts to 25 Mph in the afternoon.

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  • Temperature Real-Time

Rancho Fontana Temperature Statistics

September Temperature

Ontario International Airport (7.5 miles)

  • Lowest 19 September, 2021

    57.9 °F
  • Average September

    78.2 °F
  • Highest 5 September, 2021

    107.1 °F

Climate (2010–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2010–Present

    56.9 °F
  • Average 2010–Present

    67.1 °F
  • Average High 2010–Present

    80.3 °F
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