Grothaus Lake Weather Forecast
- 77
- 98
Hot
- 76
- 100
Hot
- 76
- 100
Hot
- 76
- 99
Hot
- 76
- 100
Hot
- 75
- 99
Hot
Today 10 Sep Bexar
Partly cloudy. Near steady temperature in the mid 90s. Southeast Winds 5 to 10 Mph. Highest heat index Readings up to 105.
Tonight 10 Sep Bexar
Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 70s. Southeast Winds 5 to 10 Mph.
Grothaus Lake Temperature Statistics
September Temperature
Castroville Municipal Airport (9.3 miles)
Lowest 2 September, 2026
73.4 °FAverage September
87.9 °FHighest 2 September, 2026
102.2 °F
Climate (2021–2026)
Castroville Municipal Airport (9.3 miles)
Average Low 2021–2026
61.7 °FAverage 2021–2026
72.5 °FAverage High 2021–2026
84.6 °F