Fontana Weather Forecast

    • 58
    • 86

    Increasing Clouds

    • 59
    • 84

    Mostly Sunny

    • 60
    • 87

    Mostly Sunny

    • 60
    • 87

    Sunny

    • 58
    • 85

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

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

Mostly sunny. Highs 83 to 89. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

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

Mostly clear this evening. Becoming partly cloudy. Lows 52 to 57. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Fontana Temperature Statistics

June Temperature

Ontario International Airport (8.1 miles)

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Climate (2021–Present)

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

    79.4 °F
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