Fontana Weather Forecast

    • 58
    • 86

    Mostly Sunny

    • 58
    • 83

    Mostly Sunny

    • 57
    • 79

    Partly Sunny

    • 55
    • 75

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

Today 25 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog this morning. Becoming sunny. Highs 83 to 90. Areas of Winds southwest to 10 Mph becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 25 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Clear this evening. Becoming partly cloudy. Patchy fog overnight. Lows 53 to 57. 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 21 June, 2026

    56.6 °F

  • Average June

    74.4 °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

    79.3 °F
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