Palomar Mountain State Park Weather Forecast

    • 69
    • 78

    Slight Chance Thunderstorms

    • 69
    • 80

    Partly Sunny

    • 70
    • 77

    Mostly Cloudy

    • 70
    • 77

    Mostly Sunny

    • 71
    • 79

    Sunny

    • 70
    • 80

    Sunny

Today 26 Aug San Diego County Mountains

Partly cloudy. A slight chance of Showers in the Morning, then a chance of Showers and Thunderstorms in the afternoon. Highs 81 to 89. Light Winds becoming west 10 Mph in the afternoon. Chance of measurable precipitation 50 percent.

Tonight 26 Aug San Diego County Mountains

Partly cloudy with a slight chance of Showers in the Evening, then mostly clear overnight. Lows 57 to 67. Areas of Winds west to 10 Mph in the evening becoming light. Chance of measurable precipitation 20 percent.

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Palomar Mountain State Park Temperature Statistics

August Temperature

Fallbrook Community Airpark (19.9 miles)

  • Lowest 2 August, 2025

    57.2 °F

  • Average August

    70 °F

  • Highest 23 August, 2025

    100.4 °F

Climate (2020–Present)

Fallbrook Community Airpark (19.9 miles)

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  • Average Low 2020–2025

    53.4 °F

  • Average 2020–2025

    61.8 °F

  • Average High 2020–2025

    74.2 °F
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