San Marcos Municipal Airport Weather Forecast

    • 30
    • 62

    Sunny

    • 39
    • 67

    Increasing Clouds

    • 49
    • 59

    Chance Rain Showers

    • 48
    • 67

    Chance Rain Showers

    • 45
    • 64

    Mostly Cloudy

    • 50
    • 69

    Mostly Cloudy

    • 40
    • 68

    Slight Chance Rain Showers

Today 18 Jan Caldwell

Sunny. Highs in the lower 60s. Southwest Winds 5 to 10 Mph.

Tonight 18 Jan Caldwell

Clear, cold with Lows in the lower 30s. Southwest Winds around 5 Mph.

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San Marcos Municipal Airport Temperature Statistics

January Temperature

San Marcos, San Marcos Municipal Airport (0 miles)

  • Lowest 15 January, 2026

    35.1 °F

  • Average January

    59.3 °F

  • Highest 2 January, 2026

    89.1 °F

Climate (2021–Present)

San Marcos, San Marcos Municipal Airport (0 miles)

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  • Average Low 2021–2026

    59.7 °F

  • Average 2021–2026

    70.3 °F

  • Average High 2021–2026

    82 °F
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