Mount Vernon Weather Forecast

    • 48
    • 72

    Sunny

    • 50
    • 77

    Sunny

    • 52
    • 78

    Sunny

    • 53
    • 81

    Sunny

    • 53
    • 82

    Sunny

    • 54
    • 79

    Sunny

Today 6 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 69 to 73. Light Winds becoming west to 10 Mph this afternoon.

Tonight 6 Dec San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 43 to 46 in wind Sheltered Areas to 46 to 52 in warmer Locations. Light Winds.

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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

    51.4 °F

  • Highest 1 December, 2025

    71.6 °F

Climate (2020–Present)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2020–2025

    54 °F

  • Average 2020–2025

    63 °F

  • Average High 2020–2025

    80.2 °F
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