Lake San Marcos Weather Forecast

    • 67
    • 82

    Increasing Clouds

    • 67
    • 80

    Patchy Fog

    • 68
    • 82

    Partly Sunny

    • 67
    • 84

    Partly Sunny

    • 67
    • 85

    Partly Sunny

    • 67
    • 87

    Partly Sunny

Today 21 Jul San Diego County Coastal Areas

Partly cloudy with patchy fog in the morning. Becoming mostly sunny. Highs 75 to 80 near the coast to 81 to 86 inland. Areas of Winds southwest to 10 Mph.

Tonight 21 Jul San Diego County Coastal Areas

Mostly clear in the evening. Becoming partly cloudy. Lows 64 to 69. Areas of Winds west to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake San Marcos Temperature Statistics

July Temperature

Carlsbad, McClellan-Palomar Airport (3.7 miles)

  • Lowest 10 July, 2026

    62.7 °F

  • Average July

    70.3 °F

  • Highest 15 July, 2026

    79.6 °F

Climate (2021–2026)

Carlsbad, McClellan-Palomar Airport (3.7 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    62.9 °F

  • Average High 2021–2026

    69.3 °F
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