Rancho Fontana Weather Forecast

    • 61
    • 88

    Mostly Sunny

    • 62
    • 89

    Becoming Sunny

    • 62
    • 92

    Sunny

    • 63
    • 93

    Mostly Sunny

    • 67
    • 94

    Mostly Sunny

    • 71
    • 97

    Hot

    • 73
    • 101

    Hot

Today 3 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Patchy fog this morning. Mostly sunny. Highs 86 to 93. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph this afternoon.

Tonight 3 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 53 to 61. Areas of Winds west to 10 Mph this evening becoming light.

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Rancho Fontana Temperature Statistics

July Temperature

Ontario International Airport (7.5 miles)

  • Lowest 1 July, 2025

    61 °F

  • Average July

    74 °F

  • Highest 1 July, 2025

    90 °F

Climate (2020–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.7 °F

  • Average High 2020–2025

    79.2 °F
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