Fontana Weather Forecast

    • 54
    • 77

    Increasing Clouds

    • 50
    • 67

    Rain Showers Likely

    • 50
    • 66

    Chance Rain Showers

    • 50
    • 70

    Partly Sunny

    • 54
    • 76

    Partly Sunny

    • 53
    • 75

    Partly Sunny

    • 56
    • 76

    Mostly Sunny

Today 24 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Highs 73 to 79. Areas of Winds south to 10 Mph becoming southwest with Gusts to 30 Mph this afternoon.

Tonight 24 Apr San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. Lows 46 to 53. Areas of Winds south 10 to 15 Mph. Gusts to 30 Mph this evening.

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

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.4 °F
Get WillyWeather+ to remove ads