Lake Arrowhead Weather Forecast

    • 61
    • 77

    Mostly Sunny

    • 63
    • 77

    Mostly Sunny

    • 62
    • 77

    Partly Sunny

    • 60
    • 71

    Chance Rain Showers

    • 59
    • 70

    Chance Rain Showers

    • 59
    • 70

    Chance Rain Showers

Today 15 Sep San Bernardino County Mountains

Sunny. Highs 67 to 77 above 6000 feet to 78 to 86 below 6000 feet. Areas of Winds south 10 Mph.

Tonight 15 Sep San Bernardino County Mountains

Clear. Lows 44 to 54 above 6000 feet to 55 to 65 below 6000 feet. Areas of Winds south to 10 Mph becoming southwest overnight. Near ridge Tops and along desert Slopes, Areas of Winds southwest 10 to 15 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Arrowhead Temperature Statistics

September Temperature

San Bernardino Intl. Airport (11.8 miles)

  • Lowest 9 September, 2025

    60.8 °F

  • Average September

    76.3 °F

  • Highest 1 September, 2025

    100.4 °F

Climate (2020–Present)

San Bernardino Intl. Airport (11.8 miles)

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

  • Average Low 2020–2025

    54.1 °F

  • Average 2020–2025

    63.2 °F

  • Average High 2020–2025

    80.5 °F
Get WillyWeather+ to remove ads