In San Antonio, summer heat is not just about the temperature on the thermometer. The real number to watch is the heat index – what it feels like when humidity is added in.
That matters here because South Texas heat often comes with muggy air. When humidity is high, sweat does not evaporate as easily, which makes it harder for your body to cool down. A 95-degree afternoon in San Antonio can feel closer to 100 to 105 degrees, especially along pavement, parking lots, playgrounds, sports fields, and construction sites.
The National Weather Service uses these heat index categories…..