Etiwanda Weather Forecast

    • 47
    • 60

    Mostly Cloudy

    • 46
    • 62

    Partly Sunny

    • 46
    • 64

    Mostly Sunny

    • 45
    • 65

    Mostly Sunny

    • 47
    • 66

    Mostly Sunny

    • 47
    • 67

    Mostly Sunny

Today 5 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy with a slight chance of Showers in the Morning, then partly cloudy in the afternoon. Patchy fog. Highs 58 to 63. Areas of Winds south to 10 Mph. Chance of measurable precipitation 20 percent.

Tonight 5 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with a slight chance of Showers in the Evening, then mostly cloudy overnight. Patchy fog. Lows 42 to 48. Light Winds. Chance of measurable precipitation 20 percent.

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Etiwanda Temperature Statistics

January Temperature

Ontario International Airport (5.6 miles)

  • Lowest 1 January, 2026

    52 °F

  • Average January

    58.5 °F

  • Highest 2 January, 2026

    66 °F

Climate (2021–Present)

Ontario International Airport (5.6 miles)

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  • Average Low 2021–2026

    55.6 °F

  • Average 2021–2026

    66.6 °F

  • Average High 2021–2026

    79 °F
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