Fontana Weather Forecast

    • 62
    • 93

    Mostly Sunny

    • 61
    • 92

    Mostly Sunny

    • 63
    • 93

    Mostly Sunny

    • 67
    • 97

    Hot

    • 68
    • 100

    Hot

    • 67
    • 99

    Hot

Today 5 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 91 to 98. Areas of Winds west to 10 Mph becoming southwest with Gusts to 25 Mph this afternoon.

Tonight 5 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 53 to 62. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Fontana Temperature Statistics

July Temperature

Ontario International Airport (8.1 miles)

  • Lowest 2 July, 2025

    57.9 °F

  • Average July

    71.9 °F

  • Highest 1 July, 2025

    90 °F

Climate (2020–Present)

Ontario International Airport (8.1 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.7 °F

  • Average High 2020–2025

    79.2 °F
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