San Antonio woke up to clear skies and a mild 65°F Thursday morning, but the humidity was already turning the air into a sticky start. By mid to late afternoon, the sun is expected to nudge temperatures into the low 90s, with most neighborhoods topping out near 91°F.
Air Quality Alert
The Texas Commission on Environmental Quality has declared an Ozone Action Day for the San Antonio area for Thursday, May 14, 2026, with ozone levels expected to climb during the warmest hours of the day, according to the National Weather Service. People with asthma or other lung issues, older adults and children are encouraged to ease off intense outdoor activity this afternoon. Simple moves like combining errands into a single trip, holding off on refueling until later, and skipping drive-through lines can help cut back on ozone formation.
Afternoon Heat and Gusty Winds
Southerly winds will pick up through the afternoon, running around 10 to 15 mph with gusts up to 20 to 25 mph. Stronger gusts are possible in hillier or more exposed parts of the area. Forecasters say humidity will keep building into the weekend, and heat index values could reach 100 to 105°F in some spots from Sunday through Tuesday. Rain chances stay low through Sunday afternoon, although a slight chance of showers and thunderstorms edges in after 7 p.m. Sunday, followed by better odds for storms and locally heavy downpours from Monday into midweek. These trends are detailed in the National Weather Service.
How to Plan
To make the most of the day without getting knocked around by the heat and ozone, try shifting tougher outdoor chores and workouts into the morning or evening, and keep water handy if you have to be outside. Check on neighbors or family members who are more sensitive to heat or air quality. Secure lightweight patio items before the afternoon gusts arrive. If you use inhalers or have breathing problems, it is a good idea to spend the peak heat and ozone hours in air-conditioned spaces.
