Fontana Weather Forecast

    • 55
    • 79

    Mostly Sunny

    • 58
    • 83

    Becoming Sunny

    • 56
    • 84

    Partly Sunny

    • 53
    • 74

    Partly Sunny

    • 51
    • 69

    Partly Sunny

    • 52
    • 70

    Partly Sunny

    • 57
    • 78

    Mostly Sunny

Today 30 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Highs 74 to 80. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 30 Mph this afternoon.

Tonight 30 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear this evening. Becoming partly cloudy. Lows 47 to 54. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

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)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    55.9 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.4 °F
Get WillyWeather+ to remove ads