At least in Austin and North of there, you start seeing 90s in April but average temperature of 90F+ is Jun-September. https://weatherspark.com/y/8004/Average-W

At least in Austin and North of there, you start seeing 90s in April but average temperature of 90F+ is Jun-September. https://weatherspark.com/y/8004/Average-Weather-in-Austin-Texas-United-States-Year-Round https://weatherspark.com/y/8004/Average-Weather-in-Austin-Te... I can't speak for South Texas as I am unfamiliar with the climate beyond some occasional visits.