Fontana Weather Forecast

    • 68
    • 93

    Mostly Sunny

    • 69
    • 93

    Mostly Sunny

    • 66
    • 93

    Mostly Sunny

    • 67
    • 92

    Mostly Sunny

    • 68
    • 94

    Mostly Sunny

Today 17 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the morning. Becoming mostly sunny. Highs 90 to 97. Areas of Winds west to 10 Mph becoming southwest with Gusts to 25 Mph in the afternoon.

Tonight 17 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 61 to 66. Areas of Winds southwest 10 to 15 Mph in the evening becoming light.

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Fontana Temperature Statistics

July Temperature

Ontario International Airport (8.1 miles)

  • Lowest 3 July, 2026

    59.6 °F

  • Average July

    78.1 °F

  • Highest 14 July, 2026

    98.1 °F

Climate (2021–2026)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67 °F

  • Average High 2021–2026

    79.3 °F
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