On the calendar, San Antonio is moving past the peak of its summer heat. Still, the next several days will feel much the same. Really hot.
National Weather Service climate records show Aug. 1-14 is historically the city’s warmest stretch, with an average high of 97 degrees. That number begins to inch downward by mid-August, dipping to 96 degrees by Aug. 17 and 95 degrees by Aug. 23.
“That drop typically happens when the areas of high pressure over the southern United States begin to weaken or shift,” said Eric Platt, a meteorologist at the National Weather Service’s Austin-San Antonio office. “Temperatures can still be quite warm, but we tend to see a more noticeable drop in October.”
This year, that transition may arrive later than usual. Highs are forecasted to range from 97 degrees to 100 degrees over the next week, with morning lows in the mid to upper 70s. Seasonal outlooks from the Climate Prediction Center tilt toward above-normal temperatures and near-normal rainfall from September through November.
“That could mean the heat lingers a little longer than average this year,” Platt said.
The summer heat fits a broader trend: The National Oceanic and Atmospheric Association ranked July 2025 as the third hottest July globally since records began in 1850. Texas saw one of its warmest thirds of Julys on record, and the Southern Region of the United States experienced significantly warmer-than-average overnight temperatures.
For residents hoping for relief, history offers some guidance. San Antonio’s average high doesn’t fall below 90 degrees until around Sept. 19, and overnight lows often stay in the 70s well into early fall.
The Old Farmer’s Almanac, a 200-year-old publication known for its long-range seasonal forecasts, predicts September will run about 2 degrees warmer than normal across the Deep South, with near-normal rainfall in Texas.
October is expected to average 1 degree cooler, but warm stretches early and late in the month could delay the first real taste of fall.