Fontana Weather Forecast

    • 72
    • 102

    Hot

    • 71
    • 101

    Hot

    • 69
    • 98

    Hot

    • 69
    • 98

    Hot

    • 70
    • 98

    Hot

    • 70
    • 98

    Hot

Today 1 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 99 to 106. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 1 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 66 to 72. Areas of Winds west 10 to 15 Mph in the evening becoming light.

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Fontana Temperature Statistics

August Temperature

Ontario International Airport (8.1 miles)

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  • Average August

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Climate (2021–2026)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.3 °F
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