Mount Vernon Weather Forecast

    • 53
    • 73

    Increasing Clouds

    • 57
    • 78

    Mostly Sunny

    • 58
    • 86

    Mostly Sunny

    • 56
    • 82

    Partly Sunny

    • 55
    • 77

    Partly Sunny

    • 58
    • 80

    Mostly Sunny

    • 59
    • 86

    Sunny

Today 22 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy this morning. Becoming mostly sunny. Patchy fog this morning. Not as warm. Highs 69 to 75. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 22 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Patchy fog overnight. Lows 48 to 53. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Mount Vernon Temperature Statistics

October Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 16 October, 2025

    46.4 °F

  • Average October

    64.6 °F

  • Highest 10 October, 2025

    95 °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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