Rancho Fontana Weather Forecast

    • 51
    • 71

    Increasing Clouds

    • 48
    • 72

    Partly Sunny

    • 48
    • 70

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 50
    • 70

    Partly Sunny

    • 51
    • 72

    Partly Sunny

Today 10 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Warmer. Highs 72 to 77. Areas of Winds east 15 to 25 Mph with Gusts to 45 Mph.

Tonight 10 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Lows 40 to 44 in wind Sheltered Areas to 42 to 51 in warmer Locations. Areas of Winds east 10 to 20 Mph. Gusts to 35 Mph. Becoming 30 Mph overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rancho Fontana Temperature Statistics

December Temperature

Ontario International Airport (7.5 miles)

  • Lowest 3 December, 2023

    41.6 °F

  • Average December

    58.4 °F

  • Highest 5 December, 2023

    82.9 °F

Climate (2018–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2018–2023

    56 °F

  • Average 2018–2023

    66.5 °F

  • Average High 2018–2023

    79.2 °F
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