Fontana Weather Forecast

    • 47
    • 65

    Increasing Clouds

    • 51
    • 74

    Decreasing Clouds

    • 53
    • 76

    Partly Sunny

    • 55
    • 78

    Partly Sunny

    • 58
    • 83

    Mostly Sunny

    • 58
    • 86

    Partly Sunny

    • 54
    • 81

    Partly Sunny

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

Partly cloudy. A slight chance of Showers this morning. Highs 62 to 68. Areas of Winds southwest to 10 Mph becoming west with Gusts to 25 Mph this afternoon. Chance of measurable precipitation 20 percent.

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

Partly cloudy. Patchy fog overnight. Colder. Lows 39 to 42 in wind Sheltered Areas to 40 to 47 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Fontana Temperature Statistics

April Temperature

Ontario International Airport (8.1 miles)

  • Lowest 13 April, 2026

    49.6 °F

  • Average April

    67.3 °F

  • Highest 4 April, 2026

    89.7 °F

Climate (2021–Present)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.4 °F
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