Alamo Weather Forecast

    • 57
    • 71

    Increasing Clouds

    • 40
    • 68

    Rain Showers

    • 22
    • 41

    Wintry Mix

    • 17
    • 33

    Partly Sunny

    • 21
    • 40

    Mostly Sunny

    • 35
    • 53

    Partly Sunny

Today 22 Jan Hays

Partly cloudy. Near steady temperature in the upper 60s. Southeast Winds around 5 Mph.

Tonight 22 Jan Hays

Mostly cloudy. A slight chance of Showers after midnight. Patchy fog after midnight. Lows in the mid 50s. Southeast Winds around 5 Mph. Chance of rain 20 percent.

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Alamo Temperature Statistics

January Temperature

San Marcos, San Marcos Municipal Airport (5 miles)

  • Lowest 18 January, 2026

    26.1 °F

  • Average January

    57 °F

  • Highest 2 January, 2026

    89.1 °F

Climate (2021–Present)

San Marcos, San Marcos Municipal Airport (5 miles)

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  • Average Low 2021–2026

    59.6 °F

  • Average 2021–2026

    70.3 °F

  • Average High 2021–2026

    82 °F
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