Sierra Lakes Weather Forecast

    • 63
    • 94

    Mostly Sunny

    • 62
    • 93

    Mostly Sunny

    • 62
    • 89

    Mostly Sunny

    • 61
    • 88

    Mostly Sunny

    • 61
    • 87

    Mostly Sunny

    • 61
    • 88

    Mostly Sunny

Today 29 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 94 to 100. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 29 Jun San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 56 to 63. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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Sierra Lakes Temperature Statistics

June Temperature

Ontario International Airport (9.3 miles)

  • Lowest 8 June, 2025

    57.7 °F

  • Average June

    74.2 °F

  • Highest 15 June, 2025

    100.7 °F

Climate (2020–Present)

Ontario International Airport (9.3 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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