Fontana Weather Forecast

    • 68
    • 93

    Partly Sunny

    • 68
    • 94

    Mostly Sunny

    • 69
    • 96

    Sunny

    • 71
    • 101

    Hot

    • 69
    • 99

    Hot

    • 70
    • 100

    Hot

Today 20 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the morning. Becoming mostly sunny. Highs 91 to 98. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 20 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 63 to 67. Areas of Winds west 10 to 15 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

    79.7 °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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