Fontana Weather Forecast

    • 56
    • 77

    Increasing Clouds

    • 56
    • 78

    Increasing Clouds

    • 56
    • 77

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

    • 58
    • 83

    Mostly Sunny

    • 60
    • 86

    Mostly Sunny

    • 62
    • 88

    Mostly Sunny

Today 28 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Highs 76 to 82. Areas of Winds south to 10 Mph. Becoming southwest 10 to 20 Mph with Gusts to 30 Mph this afternoon.

Tonight 28 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Cooler. Lows 49 to 56. Areas of Winds southwest 10 to 15 Mph with Gusts to 30 Mph becoming south overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

June Temperature

Ontario International Airport (8.1 miles)

  • Lowest 21 June, 2026

    56.6 °F

  • Average June

    74.5 °F

  • Highest 12 June, 2026

    99.6 °F

Climate (2021–2026)

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

    67.1 °F

  • Average High 2021–2026

    79.3 °F
Get WillyWeather+ to remove ads