Mount Vernon Weather Forecast

    • 55
    • 79

    Increasing Clouds

    • 53
    • 73

    Mostly Cloudy

    • 52
    • 70

    Mostly Cloudy

    • 52
    • 70

    Mostly Sunny

    • 56
    • 78

    Mostly Sunny

    • 58
    • 84

    Sunny

Today 25 May San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy with patchy fog this morning. Becoming sunny. Highs 74 to 80. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 30 Mph this afternoon.

Tonight 25 May San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the evening. Becoming mostly cloudy overnight with patchy fog. Lows 49 to 54. Areas of Winds west 10 to 15 Mph. Gusts to 25 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Vernon Temperature Statistics

May Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 6 May, 2026

    49.1 °F

  • Average May

    64.5 °F

  • Highest 11 May, 2026

    98.6 °F

Climate (2021–Present)

San Bernardino Intl. Airport (4.3 miles)

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  • Average Low 2021–2026

    54.3 °F

  • Average 2021–2026

    63.3 °F

  • Average High 2021–2026

    80.5 °F
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