Mount Vernon Weather Forecast

    • 68
    • 99

    Hot

    • 68
    • 99

    Hot

    • 70
    • 100

    Hot

    • 75
    • 104

    Hot

    • 75
    • 107

    Hot

    • 73
    • 105

    Hot

    • 71
    • 102

    Hot

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

Mostly sunny. Highs 94 to 101. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

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

Mostly clear. Lows 60 to 66. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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Mount Vernon Temperature Statistics

July Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 3 July, 2026

    58.1 °F

  • Average July

    77.8 °F

  • Highest 15 July, 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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