Barth Lake Weather Forecast

    • 69
    • 91

    Decreasing Clouds

    • 71
    • 92

    Mostly Cloudy

    • 72
    • 94

    Mostly Cloudy

    • 70
    • 96

    Mostly Cloudy

    • 68
    • 92

    Mostly Cloudy

    • 66
    • 86

    Chance Thunderstorms

Today 25 Apr Caldwell

Cloudy in the Morning, then becoming partly cloudy. Patchy fog in the morning. Highs in the lower 90s. South Winds 5 to 10 Mph.

Tonight 25 Apr Caldwell

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the lower 70s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Barth Lake Temperature Statistics

April Temperature

San Marcos, San Marcos Municipal Airport (10.6 miles)

  • Lowest 7 April, 2026

    48 °F

  • Average April

    70.2 °F

  • Highest 1 April, 2026

    89.1 °F

Climate (2021–Present)

San Marcos, San Marcos Municipal Airport (10.6 miles)

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  • Average Low 2021–2026

    60 °F

  • Average 2021–2026

    70.7 °F

  • Average High 2021–2026

    82.4 °F
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