Boulder Bay Weather Forecast

    • 47
    • 63

    Rain Showers

    • 42
    • 65

    Chance Rain Showers

    • 43
    • 68

    Mostly Sunny

    • 47
    • 68

    Slight Chance Rain Showers

    • 50
    • 70

    Slight Chance Rain Showers

    • 47
    • 71

    Slight Chance Thunderstorms

Today 18 Sep San Bernardino County Mountains

Showers. A slight chance of Thunderstorms this Morning, then a chance of Thunderstorms this afternoon. Highs 59 to 69 above 6000 feet to 68 to 76 below 6000 feet. Areas of Winds south 10 to 15 Mph with Gusts to 25 Mph.

Tonight 18 Sep San Bernardino County Mountains

Partly cloudy with a slight chance of Thunderstorms. Showers likely. Cooler. Lows 43 to 53 above 6000 feet to 52 to 61 below 6000 feet. Areas of Winds south 10 to 15 Mph with Gusts to 25 Mph. Chance of measurable precipitation 60 percent.

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Boulder Bay Temperature Statistics

September Temperature

Big Bear City Airport (5.6 miles)

  • Lowest 12 September, 2025

    32 °F

  • Average September

    57.7 °F

  • Highest 1 September, 2025

    78.8 °F

Climate (2020–Present)

Big Bear City Airport (5.6 miles)

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  • Average Low 2020–2025

    34.1 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    60.1 °F
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