Mount Vernon Weather Forecast

    • 67
    • 95

    Chance Rain Showers

    • 62
    • 85

    Chance Rain Showers

    • 57
    • 83

    Partly Sunny

    • 58
    • 82

    Mostly Sunny

    • 60
    • 85

    Mostly Sunny

    • 61
    • 89

    Mostly Sunny

Today 31 May San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the morning. Becoming mostly cloudy. Highs 92 to 98. Light Winds becoming south 10 to 15 Mph with Gusts to 30 Mph in the afternoon.

Tonight 31 May San Bernardino and Riverside County Valleys-The Inland Empire

Cloudy with a slight chance of Showers. Lows 59 to 66. Areas of Winds south 10 to 15 Mph with Gusts to 25 Mph becoming southeast overnight. Chance of measurable precipitation 20 percent.

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Mount Vernon Temperature Statistics

May Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 4 May, 2025

    50 °F

  • Average May

    63.7 °F

  • Highest 10 May, 2025

    102.2 °F

Climate (2020–Present)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2020–2025

    54.2 °F

  • Average 2020–2025

    63.3 °F

  • Average High 2020–2025

    80.6 °F
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