San Antonio is waking up warm and clear, and it is only going up from here. As of 4:55 a.m. CDT on Monday, July 27, 2026, downtown temperatures were sitting near 77°F under clear skies. By this afternoon, the city is expected to feel a whole lot steamier, with a high close to 98°F and an apparent temperature pushing past 100°F in the early to mid afternoon.
Afternoon Heat and the Week Ahead
The National Weather Service is calling for a high near 98°F today, with south southeast winds around 5 to 10 mph and heat index values topping out near 103°F this afternoon, according to NWS Austin/San Antonio. That is just the opening act. Through Thursday and Friday, afternoon highs are expected to creep into the upper 90s to around 100°F, with heat index values potentially reaching 105 to 110°F by mid to late week.
Forecasters note that if those hotter trends verify in real time, they may issue formal heat related products to reflect the rising danger.
Local Alerts and Resources
City health officials are already on alert. San Antonio Metro Health issued a Level II heat advisory on Friday, July 24, warning that sustained heat index values of 105°F or higher, combined with warm overnight lows, increase health risks for residents, according to San Antonio Metro Health. The agency is listing cooling sites and fan assistance options for those who need help beating the heat.
The city is urging people to shift outdoor work and exercise to the morning or evening hours, stay hydrated, and check on older adults and pets during the hottest part of the day. Residents can call 311 or 2-1-1 for help finding cooling centers or fan assistance locations.
Takeaway
Bottom line, plan around the hottest hours this week. Try to schedule yard work, construction, or long walks before 9 a.m. or after 7 p.m., bring extra water for kids and pets, and keep an eye on updates in case heat guidance is raised. Officials expect conditions to stay mostly dry, so the main story will be the combination of heat and humidity rather than stormy weather.
