Mount Vernon Weather Forecast

    • 58
    • 80

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

    • 57
    • 78

    Mostly Sunny

    • 57
    • 77

    Mostly Cloudy

    • 57
    • 74

    Mostly Cloudy

    • 55
    • 70

    Chance Rain Showers

Today 25 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 76 to 80. Light Winds becoming west to 10 Mph in the afternoon.

Tonight 25 Oct San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 53 to 57. Light Winds.

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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

    72.5 °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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