Rancho Fontana Weather Forecast

    • 63
    • 88

    Becoming Sunny

    • 65
    • 90

    Mostly Sunny

    • 64
    • 92

    Sunny

    • 62
    • 92

    Mostly Sunny

    • 64
    • 90

    Mostly Sunny

    • 65
    • 93

    Partly Sunny

Today 22 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 85 to 90. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 22 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 53 to 56 in wind Sheltered Areas to 56 to 64 in warmer Locations. Areas of Winds west to 10 Mph in the evening becoming light.

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Rancho Fontana Temperature Statistics

March Temperature

Ontario International Airport (7.5 miles)

  • Lowest 6 March, 2026

    51.1 °F

  • Average March

    70.6 °F

  • Highest 19 March, 2026

    99 °F

Climate (2021–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    66.9 °F

  • Average High 2021–2026

    79.3 °F
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