Mount Vernon Weather Forecast

    • 43
    • 65

    Sunny

    • 45
    • 66

    Breezy

    • 51
    • 69

    Mostly Cloudy

    • 51
    • 67

    Rain Showers

    • 52
    • 65

    Rain Showers Likely

    • 50
    • 67

    Rain Showers Likely

    • 47
    • 65

    Rain Showers Likely

Today 28 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 60 to 64. Areas of Winds north 10 to 20 Mph. Gusts to 30 Mph. Becoming 35 Mph in the afternoon.

Tonight 28 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 34 to 40 in wind Sheltered Areas to 39 to 46 in warmer Locations. Areas of Winds north 15 to 25 Mph with Gusts to 45 Mph.

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Mount Vernon Temperature Statistics

December Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 4 December, 2025

    40.3 °F

  • Average December

    58.1 °F

  • Highest 10 December, 2025

    87.8 °F

Climate (2020–Present)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2020–2025

    54.1 °F

  • Average 2020–2025

    63.1 °F

  • Average High 2020–2025

    80.3 °F
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