Rancho Fontana Weather Forecast

    • 59
    • 86

    Mostly Cloudy

    • 56
    • 82

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 58
    • 83

    Partly Sunny

    • 56
    • 78

    Mostly Cloudy

    • 54
    • 74

    Chance Rain Showers

    • 53
    • 69

    Chance Rain Showers

Today 5 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 83 to 89. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 5 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. Lows 51 to 54 in wind Sheltered Areas to 53 to 59 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Rancho Fontana Temperature Statistics

April Temperature

Ontario International Airport (7.5 miles)

  • Lowest 3 April, 2026

    53.1 °F

  • Average April

    66.6 °F

  • Highest 3 April, 2026

    81 °F

Climate (2021–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.3 °F
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