Ontario Weather Forecast

    • 53
    • 75

    Increasing Clouds

    • 53
    • 73

    Increasing Clouds

    • 54
    • 75

    Partly Sunny

    • 50
    • 71

    Chance Rain Showers

    • 50
    • 60

    Chance Rain Showers

    • 51
    • 61

    Mostly Cloudy

    • 53
    • 70

    Partly Sunny

Today 30 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Patchy fog this morning. Partly cloudy. Highs 75 to 79. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 30 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear this evening. Becoming mostly cloudy. Patchy fog overnight. Lows 46 to 53. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ontario Temperature Statistics

April Temperature

Ontario International Airport (3.7 miles)

  • Lowest 2 April, 2025

    43.6 °F

  • Average April

    63 °F

  • Highest 5 April, 2025

    89.7 °F

Climate (2020–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2020–2025

    55.6 °F

  • Average 2020–2025

    66.7 °F

  • Average High 2020–2025

    79.2 °F
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