Mount Vernon Weather Forecast

    • 52
    • 71

    Sunny

    • 52
    • 76

    Sunny

    • 53
    • 79

    Sunny

    • 52
    • 80

    Sunny

    • 51
    • 79

    Mostly Sunny

    • 50
    • 76

    Partly Sunny

Today 12 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 69 to 74. Areas of Winds east 15 to 25 Mph with Gusts to 45 Mph.

Tonight 12 Jan San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 38 to 46 in wind Sheltered Areas to 43 to 53 in warmer Locations. Areas of Winds east 10 to 20 Mph becoming north 10 to 15 Mph overnight. Gusts to 40 Mph.

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Mount Vernon Temperature Statistics

January Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 9 January, 2026

    39.6 °F

  • Average January

    53.7 °F

  • Highest 2 January, 2026

    66.2 °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

    63.1 °F

  • Average High 2021–2026

    80.2 °F
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