Rancho Fontana Weather Forecast

    • 70
    • 101

    Hot

    • 69
    • 99

    Hot

    • 66
    • 93

    Mostly Sunny

    • 65
    • 91

    Mostly Sunny

    • 65
    • 92

    Mostly Sunny

    • 66
    • 92

    Mostly Sunny

Today 15 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 99 to 106. Areas of Winds southwest to 10 Mph becoming west with Gusts to 25 Mph this afternoon.

Tonight 15 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 63 to 69. 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

July Temperature

Ontario International Airport (7.5 miles)

  • Lowest 3 July, 2026

    59.6 °F

  • Average July

    77.6 °F

  • Highest 7 July, 2026

    97.6 °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 °F

  • Average High 2021–2026

    79.3 °F
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