Mount Vernon Weather Forecast

    • 67
    • 100

    Hot

    • 69
    • 100

    Hot

    • 66
    • 100

    Hot

    • 62
    • 94

    Partly Sunny

    • 61
    • 90

    Partly Sunny

    • 61
    • 91

    Mostly Sunny

Today 18 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Sunny, hot. Highs 94 to 100. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 18 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 59 to 63 in wind Sheltered Areas to 62 to 70 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the 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

    62.6 °F

  • Highest 15 March, 2026

    93.2 °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

    80.5 °F
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