Fontana Park Weather Forecast

    • 65
    • 85

    Mostly Sunny

    • 67
    • 91

    Mostly Sunny

    • 69
    • 92

    Partly Sunny

    • 65
    • 88

    Partly Sunny

    • 70
    • 92

    Mostly Sunny

    • 73
    • 94

    Mostly Sunny

    • 74
    • 96

    Sunny

Today 11 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Warmer. Highs 81 to 87. Light Winds becoming west 10 Mph this afternoon.

Tonight 11 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows around 51 in wind Sheltered Areas to 53 to 63 in warmer Locations. Areas of Winds west to 10 Mph becoming east 10 Mph overnight.

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Fontana Park Temperature Statistics

March Temperature

Ontario International Airport (9.3 miles)

  • Lowest 6 March, 2026

    51.1 °F

  • Average March

    65.7 °F

  • Highest 8 March, 2026

    84 °F

Climate (2021–Present)

Ontario International Airport (9.3 miles)

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  • Average Low 2021–2026

    55.7 °F

  • Average 2021–2026

    66.8 °F

  • Average High 2021–2026

    79.1 °F
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