Fontana Weather Forecast

    • 64
    • 87

    Decreasing Clouds

    • 62
    • 88

    Mostly Sunny

    • 63
    • 90

    Mostly Sunny

    • 65
    • 94

    Mostly Sunny

    • 66
    • 97

    Hot

    • 65
    • 97

    Hot

    • 64
    • 93

    Mostly Sunny

Today 4 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy. Highs 86 to 92. Areas of Winds west to 10 Mph.

Tonight 4 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Lows 59 to 63. 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 2 July, 2026

    61 °F

  • Average July

    70.1 °F

  • Highest 2 July, 2026

    84 °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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