Flag Hill Park Weather Forecast

    • 65
    • 88

    Rain Showers Likely

    • 63
    • 82

    Rain Showers Likely

    • 62
    • 81

    Chance Thunderstorms

    • 64
    • 83

    Slight Chance Thunderstorms

    • 68
    • 88

    Slight Chance Thunderstorms

    • 69
    • 89

    Mostly Sunny

    • 66
    • 89

    Mostly Sunny

Today 17 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this Morning, then mostly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs 86 to 91. Light Winds becoming west 10 to 15 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 17 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy with a slight chance of Thunderstorms. A slight chance of Showers this Evening, then a chance of Showers overnight. Lows 64 to 68. Areas of Winds west to 10 Mph this evening becoming light. Chance of measurable precipitation 50 percent.

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Flag Hill Park Temperature Statistics

September Temperature

Big Bear City Airport (18.6 miles)

  • Lowest 12 September, 2025

    32 °F

  • Average September

    57.4 °F

  • Highest 1 September, 2025

    78.8 °F

Climate (2020–Present)

Big Bear City Airport (18.6 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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