Fontana Weather Forecast

    • 75
    • 104

    Hot

    • 74
    • 103

    Hot

    • 74
    • 104

    Hot

    • 71
    • 104

    Hot

    • 69
    • 100

    Hot

    • 69
    • 97

    Hot

Today 23 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Warmer. Highs 101 to 108. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 23 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 69 to 75. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

July Temperature

Ontario International Airport (8.1 miles)

  • Lowest 3 July, 2026

    59.6 °F

  • Average July

    80.2 °F

  • Highest 15 July, 2026

    102.7 °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 °F

  • Average High 2021–2026

    79.3 °F
Get WillyWeather+ to remove ads