That timing lines up with typical September weather from the National Weather Service Austin/San Antonio office. Summer heat often lasts through the month, but September usually brings South-Central Texas its first significant fall cold front and a better shot at rain than August. Typical fronts can ease highs from the mid-90s into the upper 80s and lows into the mid-60s, with average rainfall of 2 to 4 inches and little severe-weather risk. Cold fronts are already moving through North Texas and the Panhandle. Whether Central Texas is next is still an open question.