Fontana Weather Forecast

    • 41
    • 56

    Becoming Sunny

    • 50
    • 66

    Mostly Sunny

    • 52
    • 75

    Mostly Sunny

    • 56
    • 78

    Partly Sunny

    • 57
    • 78

    Partly Sunny

    • 57
    • 77

    Slight Chance Rain Showers

Today 20 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Patchy dense fog and frost in Colder. Wind Sheltered Locations this morning. Highs 52 to 58. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 20 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Patchy frost in Colder. Wind Sheltered Locations overnight. Lows around 34 in wind Sheltered Areas to 35 to 41 in warmer Locations. Areas of Winds south to 10 Mph becoming east 10 Mph overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

February Temperature

Ontario International Airport (8.1 miles)

  • Lowest 17 February, 2026

    46 °F

  • Average February

    60.6 °F

  • Highest 4 February, 2026

    87.7 °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

    55.6 °F

  • Average 2021–2026

    66.7 °F

  • Average High 2021–2026

    79.1 °F
Get WillyWeather+ to remove ads