Fernbrook Weather Forecast

    • 65
    • 89

    Chance Thunderstorms

    • 62
    • 87

    Partly Sunny

    • 63
    • 89

    Mostly Sunny

    • 65
    • 92

    Partly Sunny

    • 67
    • 93

    Mostly Sunny

    • 64
    • 93

    Mostly Sunny

Today 18 Sep San Diego County Inland Valleys

Partly cloudy with a chance of Showers. A slight chance of Thunderstorms this Morning, then a chance of Thunderstorms this afternoon. Highs 83 to 88. Areas of Winds southwest to 10 Mph becoming west this afternoon. Chance of measurable precipitation 50 percent.

Tonight 18 Sep San Diego County Inland Valleys

Partly cloudy. A slight chance of Showers and Thunderstorms in the evening. Lows 63 to 67. Areas of Winds west to 10 Mph in the evening becoming light. Chance of measurable precipitation 20 percent.

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Fernbrook Temperature Statistics

September Temperature

Ramona, Ramona Airport (4.3 miles)

  • Lowest 9 September, 2025

    53.1 °F

  • Average September

    73.9 °F

  • Highest 2 September, 2025

    97 °F

Climate (2020–Present)

Ramona, Ramona Airport (4.3 miles)

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  • Average Low 2020–2025

    51.2 °F

  • Average 2020–2025

    64.1 °F

  • Average High 2020–2025

    76.6 °F
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