Texas Moderate Heat Advisory | Effective 08/20/2026 04:17

Headline: 
Heat Advisory issued August 20 at 6:17AM CDT until August 21 at 7:00PM CDT by NWS Houston/Galveston TX
Event: 
Heat Advisory
Urgency: 
Expected
Effective: 
August 20, 2026 - 4:17am
Expires: 
August 20, 2026 - 4:30pm
Description: 
* WHAT...Heat index values up to 110 expected. * WHERE...Portions of south central and southeast Texas. * WHEN...From noon today to 7 PM CDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...This advisory may need to be extended into the weekend.
Instruction: 
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see 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. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Area Description: 
Houston; Trinity; Madison; Walker; San Jacinto; Polk; Burleson; Brazos; Washington; Grimes; Montgomery; Northern Liberty; Colorado; Austin; Waller; Inland Harris; Chambers; Wharton; Fort Bend; Inland Jackson; Inland Matagorda; Inland Brazoria; Inland Galveston; Southern Liberty; Coastal Harris; Coastal Jackson; Coastal Matagorda; Coastal Brazoria; Coastal Galveston; Matagorda Islands; Brazoria Islands; Galveston Island; Bolivar Peninsula
Forcast Office: 
NWS Houston/Galveston TX
Sender: 
w-nws.webmaster@noaa.gov