Rancho Cucamonga Weather Forecast

    • 55
    • 85

    Increasing Clouds

    • 54
    • 71

    Partly Sunny

    • 57
    • 77

    Mostly Sunny

    • 57
    • 82

    Partly Sunny

    • 55
    • 78

    Mostly Cloudy

    • 55
    • 74

    Partly Sunny

Today 21 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 83 to 89. Light Winds becoming west to 10 Mph in the afternoon.

Tonight 21 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Lows 50 to 55. Areas of Winds southwest to 10 Mph in the evening becoming light.

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Rancho Cucamonga Temperature Statistics

October Temperature

Ontario International Airport (3.7 miles)

  • Lowest 16 October, 2025

    53.1 °F

  • Average October

    67.2 °F

  • Highest 10 October, 2025

    91.9 °F

Climate (2020–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2020–2025

    55.4 °F

  • Average 2020–2025

    66.5 °F

  • Average High 2020–2025

    78.9 °F
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