Rancho Fontana Weather Forecast

    • 48
    • 67

    Mostly Cloudy

    • 46
    • 70

    Mostly Sunny

    • 48
    • 71

    Mostly Sunny

    • 51
    • 70

    Mostly Cloudy

    • 51
    • 73

    Mostly Sunny

    • 53
    • 77

    Partly Sunny

    • 54
    • 77

    Partly Sunny

Today 25 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 64 to 69. Areas of Winds north to 10 Mph. Gusts to 25 Mph this morning.

Tonight 25 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. Lows 39 to 42 in wind Sheltered Areas to 43 to 48 in warmer Locations. Areas of Winds east to 10 Mph. Gusts to 25 Mph overnight.

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Rancho Fontana Temperature Statistics

January Temperature

Ontario International Airport (7.5 miles)

  • Lowest 11 January, 2026

    39.7 °F

  • Average January

    59.6 °F

  • Highest 14 January, 2026

    84.7 °F

Climate (2021–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2021–2026

    55.6 °F

  • Average 2021–2026

    66.6 °F

  • Average High 2021–2026

    79 °F
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