Rancho Mira Loma Park Weather Forecast

    • 64
    • 92

    Mostly Sunny

    • 65
    • 92

    Mostly Sunny

    • 69
    • 95

    Mostly Sunny

    • 70
    • 98

    Hot

    • 71
    • 100

    Hot

    • 71
    • 99

    Hot

Today 18 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 89 to 97. Light Winds becoming west 10 to 15 Mph in the afternoon.

Tonight 18 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 59 to 65. Areas of Winds west 10 to 15 Mph in the evening becoming light.

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Rancho Mira Loma Park Temperature Statistics

August Temperature

Ontario International Airport (3.7 miles)

  • Lowest 1 August, 2025

    61.6 °F

  • Average August

    79.5 °F

  • Highest 7 August, 2025

    103.6 °F

Climate (2020–Present)

Ontario International Airport (3.7 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.7 °F

  • Average High 2020–2025

    79.1 °F
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