Mount Vernon Weather Forecast

    • 73
    • 104

    Hot

    • 73
    • 102

    Hot

    • 72
    • 101

    Hot

    • 72
    • 100

    Hot

    • 72
    • 100

    Hot

    • 71
    • 100

    Hot

Today 19 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 99 to 105. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph this afternoon.

Tonight 19 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 66 to 72. 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

    78.7 °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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