National Weather Service – Heat Advisory for Monday, September 13, 2026
SAN ANTONIO (KTSA News) — A Heat Advisory remains in effect through 7 p.m. Monday over the I-35 corridor and coastal plains.
San Antonio and New Braunfels are included in the alert as the daytime high should reach 99 degrees with heat index values from 108 to 111.
You are urged to take precautions when outdoors from early afternoon through early evening, which include staying hydrated, wearing loose-light-colored clothing and taking breaks indoors as much as possible.
Visit Heat.gov for more information on staying safe and cool during dangerously hot temperatures.