Mount Vernon Weather Forecast

    • 71
    • 100

    Hot

    • 73
    • 102

    Hot

    • 71
    • 102

    Hot

    • 69
    • 98

    Hot

    • 68
    • 96

    Mostly Sunny

    • 66
    • 95

    Mostly Sunny

Today 7 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 95 to 101. Light Winds becoming west 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 7 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 64 to 70. 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 4 August, 2026

    68 °F

  • Average August

    80.6 °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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