Mount Vernon Weather Forecast

    • 69
    • 95

    Mostly Sunny

    • 70
    • 97

    Hot

    • 71
    • 99

    Hot

    • 72
    • 101

    Hot

    • 72
    • 102

    Hot

    • 71
    • 101

    Hot

Today 16 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this morning. Becoming mostly sunny. Highs 91 to 97. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 16 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 62 to 68. Areas of Winds west 10 to 15 Mph in the evening becoming light.

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Mount Vernon Temperature Statistics

August Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 5 August, 2026

    66.7 °F

  • Average August

    79.9 °F

  • Highest 1 August, 2026

    104 °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

    80.3 °F
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