Fontana Park Weather Forecast

    • 44
    • 58

    Mostly Sunny

    • 45
    • 62

    Breezy

    • 46
    • 62

    Breezy

    • 49
    • 67

    Partly Sunny

    • 51
    • 68

    Rain Showers Likely

    • 53
    • 63

    Rain Showers Likely

Today 27 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 55 to 60. Light Winds.

Tonight 27 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 34 to 38 in wind Sheltered Areas to 38 to 43 in warmer Locations. Light Winds becoming east to 10 Mph overnight.

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Fontana Park Temperature Statistics

December Temperature

Ontario International Airport (9.3 miles)

  • Lowest 20 December, 2025

    45 °F

  • Average December

    61 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Ontario International Airport (9.3 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    79 °F
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