Big Bear Lake Weather Forecast

    • 56
    • 72

    Mostly Sunny

    • 56
    • 72

    Partly Sunny

    • 54
    • 66

    Slight Chance Thunderstorms

    • 52
    • 65

    Slight Chance Thunderstorms

    • 54
    • 67

    Mostly Sunny

    • 55
    • 71

    Partly Sunny

Today 17 Sep Northern Trinity

Sunny. Highs 86 to 101.

Tonight 17 Sep Northern Trinity

Clear in the evening then becoming partly cloudy. Lows 53 to 63.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Bear Lake Temperature Statistics

September Temperature

Trinity Center (14.3 miles)

  • Lowest 14 September, 2025

    50 °F

  • Average September

    69.2 °F

  • Highest 1 September, 2025

    95 °F

Climate (2020–Present)

Trinity Center (14.3 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    68.5 °F
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