Ontario Weather Forecast

    • 67
    • 99

    Hot

    • 69
    • 100

    Hot

    • 64
    • 100

    Hot

    • 62
    • 94

    Partly Sunny

    • 61
    • 90

    Mostly Sunny

    • 60
    • 88

    Partly Sunny

Today 18 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Sunny, hot. Highs 96 to 101. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 18 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 59 to 62 in wind Sheltered Areas to 62 to 71 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Ontario Temperature Statistics

March Temperature

Ontario International Airport (3.7 miles)

  • Lowest 6 March, 2026

    51.1 °F

  • Average March

    67.7 °F

  • Highest 16 March, 2026

    93.9 °F

Climate (2021–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2021–2026

    55.7 °F

  • Average 2021–2026

    66.9 °F

  • Average High 2021–2026

    79.2 °F
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