Sierra Lakes Weather Forecast

    • 45
    • 67

    Patchy Fog

    • 46
    • 63

    Breezy

    • 45
    • 66

    Breezy

    • 48
    • 69

    Sunny

    • 49
    • 70

    Sunny

    • 51
    • 72

    Mostly Sunny

    • 53
    • 74

    Mostly Sunny

Today 2 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 66 to 71. Light Winds becoming west 10 Mph this afternoon.

Tonight 2 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming cloudy. Patchy fog overnight. Lows 41 to 46. Areas of Winds south 10 Mph this evening becoming light.

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Sierra Lakes Temperature Statistics

December Temperature

Ontario International Airport (9.3 miles)

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Climate (2020–Present)

Ontario International Airport (9.3 miles)

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  • Average Low 2020–2025

    55.5 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    78.9 °F
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