Rancho Fontana Weather Forecast

    • 52
    • 74

    Patchy Fog

    • 53
    • 76

    Mostly Cloudy

    • 49
    • 72

    Chance Rain Showers

    • 49
    • 58

    Chance Rain Showers

    • 50
    • 60

    Mostly Cloudy

    • 52
    • 70

    Partly Sunny

Today 1 May San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog in the morning. Becoming mostly sunny. Highs 73 to 78. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 1 May San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 46 to 52. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Rancho Fontana Temperature Statistics

May Temperature

Ontario International Airport (7.5 miles)

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Climate (2020–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2020–2025

    55.6 °F

  • Average 2020–2025

    66.7 °F

  • Average High 2020–2025

    79.2 °F
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