Etiwanda Weather Forecast

    • 54
    • 77

    Increasing Clouds

    • 54
    • 74

    Partly Sunny

    • 54
    • 73

    Mostly Cloudy

    • 52
    • 73

    Mostly Cloudy

    • 54
    • 71

    Rain Showers

    • 54
    • 62

    Rain Showers

    • 51
    • 63

    Rain Showers

Today 19 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 76 to 80. Light Winds becoming southwest 10 Mph this afternoon.

Tonight 19 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear this evening. Becoming partly cloudy. Colder. Lows 43 to 48 in wind Sheltered Areas to 48 to 55 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

    61.3 °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

    79 °F
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