Ontario Weather Forecast

    • 54
    • 78

    Patchy Fog

    • 54
    • 72

    Chance Rain Showers

    • 54
    • 63

    Chance Rain Showers

    • 55
    • 72

    Patchy Fog

    • 56
    • 77

    Partly Sunny

    • 56
    • 77

    Patchy Fog

Today 14 May San Bernardino and Riverside County Valleys-The Inland Empire

Patchy low Clouds and fog in the morning then sunny. Highs 78 to 84. Light Winds becoming west 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 14 May San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the evening then Areas of low Clouds and fog. Lows 47 to 54. Areas of Winds southwest 15 Mph in the evening becoming light.

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Ontario Temperature Statistics

May Temperature

Ontario International Airport (3.7 miles)

  • Lowest 3 May, 2021

    55 °F
  • Average May

    66.3 °F
  • Highest 4 May, 2021

    90 °F

Climate (2010–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2010–Present

    55.9 °F
  • Average 2010–Present

    66.1 °F
  • Average High 2010–Present

    79 °F
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