Mount Vernon Weather Forecast

    • 72
    • 103

    Hot

    • 73
    • 103

    Hot

    • 72
    • 103

    Hot

    • 73
    • 104

    Hot

    • 73
    • 105

    Hot

    • 73
    • 105

    Hot

Today 22 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Sunny. Highs 99 to 105. Light Winds becoming west 10 to 15 Mph this afternoon.

Tonight 22 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 66 to 72. Areas of Winds west to 10 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 °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

    80.3 °F
Get WillyWeather+ to remove ads