Mount Vernon Weather Forecast

    • 75
    • 107

    Hot

    • 76
    • 108

    Hot

    • 77
    • 108

    Hot

    • 75
    • 107

    Hot

    • 73
    • 102

    Hot

    • 68
    • 98

    Hot

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

Mostly sunny. Highs 102 to 108. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon.

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

Mostly clear. Lows 70 to 74. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Vernon Temperature Statistics

August Temperature

San Bernardino Intl. Airport (4.3 miles)

  • Lowest 15 August, 2026

    63.9 °F

  • Average August

    79.6 °F

  • Highest 19 August, 2026

    105.8 °F

Climate (2021–2026)

San Bernardino Intl. Airport (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    63.2 °F

  • Average High 2021–2026

    80.4 °F
Get WillyWeather+ to remove ads