Carter Lake Weather Forecast
- 76
- 100
Slight Chance Thunderstorms
- 75
- 99
Slight Chance Thunderstorms
- 74
- 98
Hot
- 75
- 99
Hot
- 76
- 100
Hot
- 75
- 99
Slight Chance Thunderstorms
- 75
- 98
Hot
Today 8 Sep Guadalupe
Sunny. A slight chance of Showers and Thunderstorms. Highs in the upper 90s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent. Highest heat index Readings up to 105.
Tonight 8 Sep Guadalupe
Partly cloudy. A slight chance of Showers and Thunderstorms this evening. Lows in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent.
Carter Lake Temperature Statistics
September Temperature
San Marcos, San Marcos Municipal Airport (18 miles)
Lowest 5 September, 2026
73 °FAverage September
85.9 °FHighest 2 September, 2026
102.9 °F
Climate (2021–2026)
San Marcos, San Marcos Municipal Airport (18 miles)
Average Low 2021–2026
60.1 °FAverage 2021–2026
70.9 °FAverage High 2021–2026
82.6 °F