Fontana Weather Forecast

    • 65
    • 92

    Sunny

    • 65
    • 89

    Mostly Sunny

    • 61
    • 92

    Sunny

    • 60
    • 92

    Mostly Sunny

    • 59
    • 86

    Mostly Sunny

    • 58
    • 83

    Mostly Sunny

    • 57
    • 83

    Sunny

Today 13 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 90 to 98. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 13 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 61 to 65. Areas of Winds west 10 to 15 Mph this evening becoming light.

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Fontana Temperature Statistics

June Temperature

Ontario International Airport (8.1 miles)

  • Lowest 1 June, 2026

    58.6 °F

  • Average June

    73.6 °F

  • Highest 11 June, 2026

    93 °F

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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