Rancho Fontana Weather Forecast

    • 58
    • 86

    Increasing Clouds

    • 57
    • 82

    Partly Sunny

    • 56
    • 82

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

    • 57
    • 82

    Sunny

    • 60
    • 87

    Sunny

Today 17 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Hazy this afternoon. Highs 83 to 91. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 30 Mph this afternoon.

Tonight 17 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 53 to 58. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Rancho Fontana Temperature Statistics

June Temperature

Ontario International Airport (7.5 miles)

  • Lowest 1 June, 2026

    58.6 °F

  • Average June

    75.3 °F

  • Highest 12 June, 2026

    99.6 °F

Climate (2021–2026)

Ontario International Airport (7.5 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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