Barth Lake Weather Forecast

    • 75
    • 100

    Hot

    • 76
    • 100

    Hot

    • 78
    • 99

    Slight Chance Thunderstorms

    • 77
    • 98

    Hot

    • 77
    • 101

    Hot

    • 78
    • 100

    Hot

    • 77
    • 99

    Hot

Today 30 Jul Caldwell

Mostly sunny. Highs around 100. South Winds around 10 Mph. Highest heat index Readings up to 106.

Tonight 30 Jul Caldwell

Mostly clear this Evening, then becoming partly cloudy. Lows in the mid 70s. South Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Barth Lake Temperature Statistics

July Temperature

San Marcos, San Marcos Municipal Airport (10.6 miles)

  • Lowest 10 July, 2026

    70 °F

  • Average July

    84 °F

  • Highest 22 July, 2026

    102 °F

Climate (2021–2026)

San Marcos, San Marcos Municipal Airport (10.6 miles)

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  • Average Low 2021–2026

    60.1 °F

  • Average 2021–2026

    70.8 °F

  • Average High 2021–2026

    82.4 °F
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