Mount Vernon Weather Forecast

    • 48
    • 67

    Increasing Clouds

    • 42
    • 66

    Mostly Sunny

    • 43
    • 66

    Partly Sunny

    • 43
    • 69

    Mostly Sunny

    • 47
    • 71

    Mostly Sunny

    • 47
    • 71

    Mostly Sunny

Today 23 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with a slight chance of Showers. Patchy fog. Highs 62 to 67. Light Winds becoming southwest 10 Mph in the afternoon. Chance of measurable precipitation 20 percent.

Tonight 23 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the evening. Becoming cloudy. Patchy fog. Lows 45 to 50. Areas of Winds southwest 10 Mph.

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Mount Vernon Temperature Statistics

January Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 10 January, 2026

    37.2 °F

  • Average January

    55.6 °F

  • Highest 14 January, 2026

    82.4 °F

Climate (2021–Present)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2021–2026

    54.1 °F

  • Average 2021–2026

    63 °F

  • Average High 2021–2026

    80.2 °F
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