Rancho Fontana Weather Forecast

    • 46
    • 67

    Breezy

    • 46
    • 68

    Partly Sunny

    • 45
    • 65

    Breezy

    • 44
    • 67

    Mostly Sunny

    • 47
    • 68

    Mostly Sunny

    • 47
    • 66

    Mostly Sunny

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

Mostly sunny. Highs 66 to 71. Areas of Winds north 15 to 25 Mph. Gusts to 40 Mph. Becoming 35 Mph this afternoon.

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

Mostly clear. Lows 39 to 42 in wind Sheltered Areas to 42 to 47 in warmer Locations. Areas of Winds east 10 to 20 Mph. Gusts to 35 Mph. Becoming 25 Mph overnight.

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Rancho Fontana Temperature Statistics

December Temperature

Ontario International Airport (7.5 miles)

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  • Average December

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Climate (2020–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    78.9 °F
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