Rancho Cucamonga Weather Forecast

    • 48
    • 77

    Mostly Sunny

    • 47
    • 74

    Mostly Sunny

    • 45
    • 68

    Breezy

    • 44
    • 68

    Breezy

    • 44
    • 69

    Breezy

    • 44
    • 71

    Mostly Sunny

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

Mostly sunny. Highs 75 to 80. Light Winds.

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

Clear. Lows 40 to 48. Light Winds.

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Rancho Cucamonga Temperature Statistics

December Temperature

Ontario International Airport (3.7 miles)

  • Lowest

  • Average December

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Climate (2010–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2010–Present

    57 °F
  • Average 2010–Present

    67.3 °F
  • Average High 2010–Present

    80.4 °F
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