San Marcos Weather Forecast

    • 66
    • 85

    Becoming Sunny

    • 66
    • 85

    Partly Sunny

    • 66
    • 85

    Mostly Sunny

    • 66
    • 86

    Mostly Sunny

    • 67
    • 87

    Mostly Sunny

    • 66
    • 86

    Mostly Sunny

Today 4 Aug San Diego County Inland Valleys

Partly cloudy in the morning. Becoming sunny. Highs 84 to 88 in the western Valleys to 92 to 97 near the Foothills. Areas of Winds west to 10 Mph.

Tonight 4 Aug San Diego County Inland Valleys

Mostly clear in the evening. Becoming partly cloudy. Lows 62 to 67. Areas of Winds west to 10 Mph in the evening becoming light.

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San Marcos Temperature Statistics

August Temperature

Carlsbad, McClellan-Palomar Airport (6.2 miles)

  • Lowest 1 August, 2026

    69.1 °F

  • Average August

    73.3 °F

  • Highest 1 August, 2026

    79 °F

Climate (2021–2026)

Carlsbad, McClellan-Palomar Airport (6.2 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    63 °F

  • Average High 2021–2026

    69.3 °F
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