Fontana Weather Forecast

    • 64
    • 95

    Hot

    • 66
    • 95

    Partly Sunny

    • 67
    • 94

    Partly Sunny

    • 67
    • 94

    Mostly Sunny

    • 71
    • 97

    Hot

Today 10 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 91 to 99. Areas of Winds southwest to 10 Mph becoming west with Gusts to 25 Mph this afternoon.

Tonight 10 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Patchy dense fog overnight. Lows 59 to 64. Areas of Winds west to 10 Mph this 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

    77.2 °F

  • Highest 7 July, 2026

    97.6 °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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