Mount Vernon Weather Forecast

    • 56
    • 79

    Increasing Clouds

    • 56
    • 80

    Partly Sunny

    • 56
    • 80

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 59
    • 85

    Mostly Sunny

    • 62
    • 89

    Partly Sunny

    • 63
    • 91

    Mostly Sunny

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

Partly cloudy this morning. Becoming mostly sunny. Highs 76 to 82. Areas of Winds south to 10 Mph. Becoming southwest 10 to 20 Mph with Gusts to 30 Mph this afternoon.

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

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Cooler. Lows 49 to 56. Areas of Winds southwest 10 to 15 Mph with Gusts to 30 Mph becoming south overnight.

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Mount Vernon Temperature Statistics

June Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 20 June, 2026

    55.4 °F

  • Average June

    70.2 °F

  • Highest 12 June, 2026

    100.4 °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

    80.4 °F
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