Mount Vernon Weather Forecast

    • 54
    • 67

    Rain Showers

    • 55
    • 70

    Partly Sunny

    • 57
    • 76

    Sunny

    • 58
    • 79

    Mostly Sunny

    • 58
    • 80

    Mostly Sunny

    • 58
    • 80

    Partly Sunny

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

Scattered Thunderstorms. Showers. Highs 64 to 68. Areas of Winds south to 10 Mph.

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

Mostly cloudy with a chance of Showers in the Evening, then partly cloudy with a slight chance of Showers overnight. Lows 48 to 54. Areas of Winds southwest to 10 Mph in the evening becoming light. Chance of measurable precipitation 50 percent.

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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

    73.7 °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

    63.3 °F

  • Average High 2021–2026

    80.4 °F
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