San Antonio Officials Warn of 105°F Heat Wave Through July 4th

San Antonio is entering what city health officials are calling one of the most dangerous heat stretches in recent memory, with Bexar County's emergency management office warning that the combination of high temperatures, elevated humidity and overnight lows staying above 80°F creates lethal conditions for anyone without reliable air conditioning. The National Weather Service office in New Braunfels issued an excessive heat warning effective through Sunday, July 5.

The timing is not incidental. Europe is burying more than 2,000 people killed during its most recent heat event, and public health researchers who track heat mortality say American cities have been slow to absorb that lesson. San Antonio, with roughly 1.5 million residents in the metro area and a median household income around $54,000, well below the national median, faces compounding vulnerability. A large share of the population lives in older housing stock in the South Side and East Side without central air, and CPS Energy reported this week that systemwide demand hit a record 6,100 megawatts on Wednesday afternoon.

Where to Go and Who Is Most at Risk

The city's Metropolitan Health District activated its full network of 25 cooling centers on Thursday morning. Locations include the Carver Community Cultural Center on East Commerce Street, the Claude Black Community Center on Montana Street and multiple branches of the San Antonio Public Library system, including the Central Library on Soledad Street downtown. All sites are open through 8 p.m. daily and are free to enter, no ID required. The district's heat emergency hotline, 210-207-5980, began routing calls to bilingual staff as of July 1.

Officials from the San Antonio Fire Department say they have repositioned two additional medic units to the near-West Side and Harlandale neighborhoods through the holiday weekend, citing historical call volume data from heat events. The department responded to 47 heat-related emergency calls in a single 24-hour period during the 2024 heat dome, a figure that department leadership said was the catalyst for this year's prepositioned resources.

CPS Energy spokesperson communications this week stressed that the utility's "keep the lights on" pledge, a policy that suspends residential disconnections when heat warnings are active, remains in effect. Customers who are behind on bills are being directed to call 210-353-2222 to arrange payment plans before the suspension window closes. The utility is also offering bill credits of up to $75 for low-income customers enrolled in its LITE-UP Texas assistance program who weatherize before August 31.

Experts Point to Structural Problems, Not Just the Forecast

Researchers at UT San Antonio's urban planning department have been pointing to the city's tree canopy deficit for years. A 2025 city-commissioned study found that the 78207 zip code, covering much of the West Side, has less than 14 percent canopy cover, compared with roughly 38 percent in Alamo Heights. That disparity translates directly to surface temperatures that can run 10 to 15 degrees hotter on exposed pavement, the study found.

The San Antonio River Authority and the city's Parks and Recreation Department are jointly administering a tree-planting initiative called the Urban Forest Master Plan, which has so far placed about 4,200 trees since its 2023 launch, targeting census tracts with the lowest canopy coverage. Officials say the program is on track to hit 10,000 trees by the end of fiscal year 2027, though arborists working with the city acknowledge that newly planted stock provides negligible shade for at least five years.

For residents heading into the holiday weekend, the Metropolitan Health District's guidance is specific: check on neighbors over 65 or under five years old by 10 a.m. each day, never leave anyone in a parked car, interior temperatures can reach 130°F within 20 minutes, and treat any confusion, stopped sweating or rapid heartbeat as a medical emergency requiring a 911 call. The cooling center network will remain open through Monday, July 6, including on the Fourth of July itself, when the city's official fireworks show at Woodlawn Lake Park draws tens of thousands of people to an outdoor venue with limited shade.