Are you eagerly awaiting the first true chill of fall in South Texas? San Antonio residents might have noticed a series of weak cold fronts recently, but these have only brought minor relief from the lingering summer heat. Looking back at weather records since 2000, the first significant cold front, characterized by a temperature drop of at least 15 degrees, typically arrives around October 13. This timing closely aligns with the city's average first low of 50 degrees Fahrenheit.