Rancho Cucamonga Weather Forecast

    • 55
    • 72

    Mostly Cloudy

    • 54
    • 76

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

    • 58
    • 83

    Mostly Sunny

    • 61
    • 89

    Mostly Sunny

    • 60
    • 87

    Mostly Sunny

Today 28 May San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy in the morning. Becoming partly cloudy. Patchy fog in the morning. Patchy drizzle in the morning. Highs 71 to 76. Light Winds becoming west 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 28 May San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the evening. Becoming mostly cloudy. Patchy fog overnight. Lows 49 to 55. Areas of Winds southwest 15 Mph with Gusts to 25 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

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Rancho Cucamonga Temperature Statistics

May Temperature

Ontario International Airport (3.7 miles)

  • Lowest 11 May, 2022

    48 °F
  • Average May

    65.9 °F
  • Highest 14 May, 2022

    97 °F

Climate (2010–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2010–Present

    56 °F
  • Average 2010–Present

    66.3 °F
  • Average High 2010–Present

    79.3 °F
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