Palomar Mountain State Park Weather Forecast

    • 66
    • 81

    Increasing Clouds

    • 61
    • 74

    Mostly Cloudy

    • 55
    • 68

    Mostly Sunny

    • 63
    • 73

    Mostly Sunny

    • 65
    • 80

    Sunny

    • 66
    • 82

    Mostly Sunny

    • 66
    • 82

    Sunny

Today 26 Sep San Diego County Mountains

Sunny. Highs 81 to 89.

Tonight 26 Sep San Diego County Mountains

Cloudy. Lows 57 to 67. Areas of Winds west to 10 Mph this evening becoming light.

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Palomar Mountain State Park Temperature Statistics

September Temperature

Fallbrook Community Airpark (19.9 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    72.8 °F

  • Highest 8 September, 2026

    104 °F

Climate (2021–2026)

Fallbrook Community Airpark (19.9 miles)

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  • Average Low 2021–2026

    53.9 °F

  • Average 2021–2026

    62.2 °F

  • Average High 2021–2026

    74.5 °F
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