Fontana Weather Forecast

    • 57
    • 81

    Sunny

    • 55
    • 81

    Mostly Sunny

    • 54
    • 79

    Partly Sunny

    • 53
    • 75

    Partly Sunny

    • 55
    • 81

    Sunny

    • 56
    • 84

    Sunny

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

Sunny. Highs 78 to 83. Areas of Winds north 10 to 20 Mph. Gusts to 30 Mph. Becoming 35 Mph this afternoon.

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

Clear. Lows 44 to 49 in wind Sheltered Areas to 49 to 57 in warmer Locations. Areas of Winds east 10 to 20 Mph. Gusts to 35 Mph. Becoming 30 Mph overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Fontana Temperature Statistics

January Temperature

Ontario International Airport (8.1 miles)

  • Lowest 11 January, 2026

    39.7 °F

  • Average January

    59.4 °F

  • Highest 14 January, 2026

    84.7 °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 °F
Get WillyWeather+ to remove ads