Fontana Weather Forecast

    • 62
    • 92

    Mostly Sunny

    • 63
    • 91

    Mostly Sunny

    • 63
    • 91

    Mostly Sunny

    • 63
    • 89

    Sunny

    • 63
    • 88

    Sunny

    • 64
    • 89

    Sunny

Today 10 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Sunny, warmer. Highs 89 to 97. Areas of Winds west to 10 Mph becoming southwest with Gusts to 25 Mph this afternoon.

Tonight 10 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 57 to 62. 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

    72.5 °F

  • Highest 3 June, 2026

    88.6 °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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