Mount Vernon Weather Forecast

    • 73
    • 105

    Hot

    • 71
    • 102

    Hot

    • 67
    • 98

    Hot

    • 64
    • 93

    Mostly Sunny

    • 66
    • 89

    Partly Sunny

    • 68
    • 91

    Partly Sunny

Today 28 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy. Highs 101 to 107. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 30 Mph this afternoon.

Tonight 28 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 68 to 73. 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

August Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 15 August, 2026

    63.9 °F

  • Average August

    80.6 °F

  • Highest 26 August, 2026

    109.4 °F

Climate (2021–2026)

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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