San Antonio rolled into Wednesday, May 13, 2026, under clear skies and a mild start in the 60s, with a sunny warmup locked in for the afternoon. The National Weather Service is calling for a high near 90 later today, with light south-southeast winds and dry weather holding on through the weekend.
Afternoon Heat and Ozone
The Texas Commission on Environmental Quality has called an Ozone Action Day for the San Antonio area for Wednesday, advising residents, especially children, older adults and people with lung disease, to limit strenuous outdoor activity and cut back on driving during the afternoon ozone peak, according to TCEQ. The alert is expected to stay in effect through about 7 p.m. Simple steps like combining errands, delaying refueling and skipping the drive-through can help dial back ozone formation.
Weekend Heat and Late-Week Storm Chances
Temperatures climb into the low 90s later this week, around 91 on Thursday and near 92 Friday and Saturday, with humidity and higher heat-index values likely, according to the NWS Austin/San Antonio. Southerly winds will ramp up, with gusts up to 20–25 mph Thursday into Friday and some spots pushing around 30 mph by Sunday. A slight chance of showers and thunderstorms shows up late Sunday night before rain chances tick up Monday and Tuesday, with roughly a 30–50% chance of storms early next week.
What To Expect
Plan on extra water and try to shift tougher outdoor chores or workouts to the morning or evening to dodge the afternoon ozone peak and higher heat index. Tie down or stow lightweight yard items before the gustier afternoons hit, and keep an eye on the forecast if you have outdoor plans late Sunday into Monday when storms are more likely. If you or someone you look after uses inhalers or has respiratory issues, it is a good day to stick to air-conditioned spaces in the mid-afternoon.
More From Hoodline
We flagged this warming trend in an earlier Hoodline update on May 8, and this midday check-in adds the Ozone Action Day callout plus a clearer signal for late-week gusts. For the lead-up and bigger-picture setup, revisit our May 8 forecast on storms sneaking into San Antonio tonight.
