Lake San Marcos Weather Forecast

    • 53
    • 71

    Chance Rain Showers

    • 50
    • 67

    Partly Sunny

    • 52
    • 71

    Partly Sunny

    • 54
    • 70

    Partly Sunny

    • 53
    • 67

    Mostly Cloudy

    • 52
    • 67

    Partly Sunny

Today 21 Apr San Diego County Coastal Areas

Partly cloudy this morning. Becoming mostly sunny. Highs 69 to 73. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph this afternoon.

Tonight 21 Apr San Diego County Coastal Areas

Cloudy with a chance of Showers in the Evening, then partly cloudy overnight. Lows 51 to 57. Areas of Winds northwest 10 Mph. Chance of measurable precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake San Marcos Temperature Statistics

April Temperature

Carlsbad, McClellan-Palomar Airport (3.7 miles)

  • Lowest 14 April, 2026

    52.6 °F

  • Average April

    63.7 °F

  • Highest 4 April, 2026

    81.6 °F

Climate (2021–Present)

Carlsbad, McClellan-Palomar Airport (3.7 miles)

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  • Average Low 2021–2026

    56.9 °F

  • Average 2021–2026

    62.8 °F

  • Average High 2021–2026

    69.1 °F
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