National Weather Service Austin Extends Heat Advisory Through Sunday Evening
The Heat Advisory across 18 Central Texas zones will now remain in effect until 7 PM CDT Sunday.
4 reports on this incident · first at Aug 19, 2026, 11:58 a.m. ET
Earlier reports
Aug 19, 2026, 12:08 p.m. ET
Heat Advisory in Effect for 18 Central Texas Counties, From Llano to San Antonio
A Heat Advisory covering 18 counties across Central Texas takes effect on August 20, 2026, according to the advisory record issued by National Weather Service Austin at 10:52 a.m. on August 19, 2026.
The advisory runs from 2 PM Thursday to 7 PM CDT Sunday, ending at 7 p.m. on August 23, 2026. The advisory record lists the affected area as the northern Hill Country, I-35 Corridor, and Coastal Plains, and states that temperatures up to 104 and heat index values up to 110 are expected.
The 18 counties named in the record are Llano, Burnet, Williamson, Hays, Travis, Bastrop, Lee, Bexar, Comal, Guadalupe, Caldwell, Fayette, Atascosa, Wilson, Karnes, Gonzales, DeWitt and Lavaca. Cities listed within the advisory area include Llano, Bastrop, New Braunfels, Floresville, Georgetown, Karnes City, Lockhart, La Grange, Burnet, Austin, Giddings, Pleasanton, Hallettsville, San Marcos, Seguin, San Antonio, Gonzales and Cuero.
The hazard is rated at the advisory level. Hot temperatures and high humidity may cause heat illnesses, the National Weather Service Austin record states.
The advisory instructs residents to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors, and to take extra precautions when outside. It also advises wearing lightweight and loose fitting clothing, limiting strenuous activities to early morning or evening, and taking action at the first symptoms of heat exhaustion and heat stroke.
To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments, according to the advisory. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Aug 19, 2026, 12:00 p.m. ET
Heat Advisory Covers Llano, Burnet, Williamson and 15 More Central Texas Counties
A Heat Advisory issued by National Weather Service Austin covers 18 counties in Central and South Central Texas, according to the advisory product the office issued at 10:52 a.m. on Aug. 19, 2026.
The advisory takes effect at 2 PM Thursday, Aug. 20, 2026, and expires at 7 PM CDT Sunday, Aug. 23, 2026. The product states that "Temperatures up to 104 and heat index values up to 110 expected."
The counties named in the advisory are Llano, Burnet, Williamson, Hays, Travis, Bastrop, Lee, Bexar, Comal, Guadalupe, Caldwell, Fayette, Atascosa, Wilson, Karnes, Gonzales, DeWitt and Lavaca. The Weather Service describes the affected area as the northern Hill Country, the I-35 Corridor and the Coastal Plains, and lists the cities of Llano, Bastrop, New Braunfels, Floresville, Georgetown, Karnes City, Lockhart, La Grange, Burnet, Austin, Giddings, Pleasanton, Hallettsville, San Marcos, Seguin, San Antonio, Gonzales and Cuero.
On the hazard, the advisory says: "Hot temperatures and high humidity may cause heat illnesses."
The Weather Service advises residents to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. It recommends taking extra precautions outside, wearing lightweight and loose fitting clothing, and limiting strenuous activities to early morning or evening. To reduce risk during outdoor work, the advisory notes that the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments.
Anyone overcome by heat should be moved to a cool and shaded location, the advisory says, adding: "Heat stroke is an emergency! Call 9 1 1."
The advisory carries the headline "HEAT ADVISORY IN EFFECT FROM 2 PM THURSDAY TO 7 PM CDT SUNDAY" and was distributed through the National Weather Service raw text product feed.
Aug 19, 2026, 11:58 a.m. ETFirst report
Heat Advisory Hits Llano, Burnet, Williamson and 15 More Texas Counties Thursday
National Weather Service Austin issued a Heat Advisory at 10:52 AM on August 19, 2026, for 18 counties in central and south Texas, according to the advisory text published in the National Weather Service raw product archive. The advisory record, headlined "HEAT ADVISORY IN EFFECT FROM 2 PM THURSDAY TO 7 PM CDT SUNDAY," takes effect at 2 PM Thursday, August 20, 2026, and expires at 7 PM CDT Sunday, August 23, 2026.
The advisory record states that temperatures up to 104 and heat index values up to 110 are expected across the northern Hill Country, I-35 Corridor, and Coastal Plains.
The 18 counties named in the record are Llano, Burnet, Williamson, Hays, Travis, Bastrop, Lee, Bexar, Comal, Guadalupe, Caldwell, Fayette, Atascosa, Wilson, Karnes, Gonzales, DeWitt and Lavaca. Cities listed in the advisory include Llano, Bastrop, New Braunfels, Floresville, Georgetown, Karnes City, Lockhart, La Grange, Burnet, Austin, Giddings, Pleasanton, Hallettsville, San Marcos, Seguin, San Antonio, Gonzales and Cuero.
The advisory record warns that hot temperatures and high humidity may cause heat illnesses.
Among the precautions listed in the record: drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. The record advises taking extra precautions when outside, wearing lightweight and loose fitting clothing, and limiting strenuous activities to early morning or evening. To reduce risk during outdoor work, the record notes, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. "Heat stroke is an emergency! Call 9 1 1," the advisory record states.
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