Fontana Weather Forecast

    • 71
    • 98

    Hot

    • 70
    • 98

    Hot

    • 68
    • 98

    Hot

    • 68
    • 97

    Hot

    • 70
    • 99

    Hot

    • 71
    • 101

    Hot

Today 26 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 96 to 104. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 26 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the evening. Becoming mostly clear. Lows 65 to 71. Areas of Winds west to 10 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

    80.9 °F

  • Highest 15 July, 2026

    102.7 °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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