Mount Vernon Weather Forecast

    • 62
    • 90

    Mostly Sunny

    • 63
    • 92

    Becoming Sunny

    • 64
    • 95

    Sunny

    • 64
    • 96

    Mostly Sunny

    • 68
    • 96

    Mostly Sunny

    • 73
    • 100

    Hot

    • 74
    • 103

    Hot

Today 3 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Patchy fog this morning. Mostly sunny. Highs 86 to 93. Areas of Winds southwest to 10 Mph. Becoming 10 to 15 Mph this afternoon.

Tonight 3 Jul San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear. Lows 53 to 61. Areas of Winds west to 10 Mph this evening becoming light.

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Mount Vernon Temperature Statistics

July Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 1 July, 2025

    62.4 °F

  • Average July

    72.8 °F

  • Highest 1 July, 2025

    95 °F

Climate (2020–Present)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2020–2025

    54.2 °F

  • Average 2020–2025

    63.3 °F

  • Average High 2020–2025

    80.6 °F
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