Mount Vernon Weather Forecast

    • 51
    • 76

    Increasing Clouds

    • 51
    • 73

    Decreasing Clouds

    • 58
    • 87

    Sunny

    • 61
    • 94

    Sunny

    • 61
    • 97

    Hot

    • 60
    • 95

    Mostly Sunny

    • 61
    • 96

    Mostly Sunny

Today 9 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 71 to 76. Light Winds becoming southwest 10 to 15 Mph with Gusts to 30 Mph this afternoon.

Tonight 9 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Patchy fog overnight. Lows 43 to 46 in wind Sheltered Areas to 45 to 54 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 30 Mph this evening becoming light.

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Mount Vernon Temperature Statistics

March Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 6 March, 2026

    44.1 °F

  • Average March

    60 °F

  • Highest 1 March, 2026

    82.4 °F

Climate (2021–Present)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    63.2 °F

  • Average High 2021–2026

    80.4 °F
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