Bluebonnet Lake Weather Forecast

    • 70
    • 97

    Hot

    • 71
    • 96

    Mostly Cloudy

    • 72
    • 97

    Hot

    • 73
    • 97

    Hot

    • 72
    • 96

    Chance Rain Showers

    • 67
    • 93

    Chance Rain Showers

Today 25 Sep Caldwell

Partly cloudy. Highs in the upper 90s. Northeast Winds 5 to 10 Mph.

Tonight 25 Sep Caldwell

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 70s. East Winds 5 to 10 Mph, becoming southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Bluebonnet Lake Temperature Statistics

September Temperature

San Marcos, San Marcos Municipal Airport (4.3 miles)

  • Lowest 20 September, 2026

    70 °F

  • Average September

    85.6 °F

  • Highest 2 September, 2026

    102.9 °F

Climate (2021–2026)

San Marcos, San Marcos Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    60.2 °F

  • Average 2021–2026

    71 °F

  • Average High 2021–2026

    82.6 °F
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