Fontana Weather Forecast

    • 56
    • 81

    Becoming Sunny

    • 56
    • 80

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

    • 60
    • 88

    Sunny

    • 63
    • 94

    Sunny

    • 64
    • 95

    Mostly Sunny

    • 63
    • 95

    Sunny

Today 19 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy with patchy fog this morning. Becoming sunny. Highs 79 to 85. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 19 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear this evening. Becoming partly cloudy. Lows 51 to 56. 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)

  • Lowest 1 June, 2026

    58.6 °F

  • Average June

    75.4 °F

  • Highest 12 June, 2026

    99.6 °F

Climate (2021–2026)

Ontario International Airport (8.1 miles)

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  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.4 °F
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