Etiwanda Weather Forecast

    • 56
    • 81

    Mostly Sunny

    • 56
    • 79

    Partly Sunny

    • 54
    • 80

    Mostly Sunny

    • 55
    • 81

    Mostly Sunny

    • 54
    • 80

    Partly Sunny

    • 53
    • 75

    Partly Sunny

Today 12 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 79 to 84. Light Winds becoming west to 10 Mph this afternoon.

Tonight 12 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the evening. Becoming mostly clear. Lows 47 to 51 in wind Sheltered Areas to 51 to 58 in warmer Locations. Light Winds.

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Etiwanda Temperature Statistics

December Temperature

Ontario International Airport (5.6 miles)

  • Lowest 2 December, 2025

    46 °F

  • Average December

    60.6 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Ontario International Airport (5.6 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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