Barth Lake Weather Forecast

    • 77
    • 94

    Increasing Clouds

    • 76
    • 94

    Slight Chance Thunderstorms

    • 77
    • 95

    Partly Sunny

    • 76
    • 94

    Chance Thunderstorms

    • 73
    • 89

    Rain Showers Likely

    • 73
    • 86

    Chance Thunderstorms

Today 11 Jun Caldwell

Mostly cloudy with a slight chance of Showers this Morning, then partly cloudy this afternoon. Highs in the mid 90s. South Winds 10 to 15 Mph. Highest heat index Readings up to 106.

Tonight 11 Jun Caldwell

Partly cloudy in the Evening, then becoming mostly cloudy. Humid with Lows in the upper 70s. Southeast Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Barth Lake Temperature Statistics

June Temperature

San Marcos, San Marcos Municipal Airport (10.6 miles)

  • Lowest 1 June, 2026

    69.1 °F

  • Average June

    80 °F

  • Highest 1 June, 2026

    91.9 °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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