Julian County Park Weather Forecast

    • 62
    • 81

    Chance Thunderstorms

    • 58
    • 77

    Rain Showers Likely

    • 60
    • 77

    Chance Thunderstorms

    • 62
    • 80

    Slight Chance Thunderstorms

    • 65
    • 81

    Slight Chance Thunderstorms

    • 65
    • 84

    Mostly Sunny

Today 17 Sep San Diego County Mountains

Partly cloudy this Morning, then mostly cloudy with a chance of Showers and a slight chance of Thunderstorms this afternoon. Highs 77 to 86. Areas of Winds east 10 Mph. Chance of measurable precipitation 30 percent.

Tonight 17 Sep San Diego County Mountains

Mostly cloudy in the evening. Becoming partly cloudy. A chance of Showers and a slight chance of Thunderstorms. Cooler. Lows 58 to 66. Areas of Winds west 10 Mph. Chance of measurable precipitation 40 percent.

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Julian County Park Temperature Statistics

September Temperature

Ramona, Ramona Airport (18 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 (18 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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