San Antonio, Texas Weather in August

August heat

San Antonio's August afternoons are seriously hot, with highs around 37°C and sticky-feeling humidity. July is a little cooler, while September brings more rain. Showers can interrupt plans, but they fall on only a handful of days.

The River Walk is pleasant in the evening, when you can take a boat tour or find dinner along the water. Save the Alamo and the other downtown sights for the cooler part of the day. The exposed Mission Reach trail is a tough choice in the afternoon heat.

Events and crowds

Fiesta Noche del Río, a summer music and dance show at the Arneson River Theatre, runs during the season through August. Texas also holds its annual sales-tax holiday in August, which can bring shoppers to malls and outlets.

Families who enjoy evening shows may find the outdoor setting worth the warm night. Summer holidays bring families to San Antonio, but August is less comfortable for sightseeing than the popular November-to-April stretch. Hotel rates can be lower than in those cooler months, though prices vary.

Plan around the warmth

You'll get plenty of daylight, but the midday sun can make a long day outdoors feel draining. Spend the hottest hours at the Witte Museum or another indoor stop, then head out again later. Rain may briefly affect outdoor plans, so keep a nearby indoor option in mind.

For a quieter city break, August can suit you better than spring's busier travel season, as long as you're comfortable with the heat. On the River Walk, use the downtown loop for an evening stroll rather than treating it as a cool escape during the day; the buildings shade parts of it, but the air stays warm.