Mount Vernon Weather Forecast

    • 56
    • 76

    Partly Sunny

    • 58
    • 75

    Mostly Cloudy

    • 56
    • 70

    Mostly Cloudy

    • 57
    • 68

    Rain Showers Likely

    • 55
    • 68

    Chance Rain Showers

    • 57
    • 73

    Mostly Sunny

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

Partly cloudy. Highs 72 to 77. Light Winds becoming southwest to 10 Mph this afternoon.

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

Partly cloudy in the evening. Becoming mostly cloudy. Lows 50 to 55. Areas of Winds west to 10 Mph in the evening becoming light.

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Mount Vernon Temperature Statistics

October Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 14 October, 2026

    48.9 °F

  • Average October

    71.2 °F

  • Highest 2 October, 2026

    104 °F

Climate (2021–2026)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2021–2026

    54.3 °F

  • Average 2021–2026

    63.4 °F

  • Average High 2021–2026

    80.4 °F
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