Special Weather Statement Issued for Deep South Texas
A Special Weather Statement is in effect across portions of Deep South Texas on Monday, August 31, 2026, as hot temperatures combined with high humidity are expected to create dangerous heat conditions this afternoon and evening.
The National Weather Service office in Brownsville reports that heat index values are expected to reach 105 to 110 degrees, with some locations potentially experiencing heat index values at or above 111 degrees. (National Weather Service)
The combination of actual air temperatures and atmospheric moisture is the primary concern. High humidity makes it harder for the human body to cool itself through evaporation of sweat, causing the temperature to feel significantly hotter than the thermometer reading.
Areas Included in the Special Weather Statement
The statement covers:
- Brooks County
- Inland Kenedy County
- Starr County
- Southern Hidalgo County
- Inland Willacy County
- Inland Cameron County
- Coastal Kenedy County
- Northern Hidalgo County
- Coastal Willacy County
- Coastal Cameron County
Communities specifically included in the statement include Falfurrias, Sarita, Rio Grande City, Roma, McAllen, Edinburg, Pharr, Mission, Weslaco, Raymondville, Brownsville, Harlingen, San Manuel, Port Mansfield, Port Isabel, and Laguna Vista. (National Weather Service)
Why the Heat Index Matters
The heat index represents how hot conditions feel when temperature and humidity are considered together.
When humidity is elevated, sweat does not evaporate as efficiently from the skin. As a result, the body loses one of its most important natural cooling mechanisms.
This means people can become overheated even when they do not initially feel as though they are in danger.
At heat index values above 100 degrees, prolonged outdoor exposure can become increasingly hazardous, particularly for people working outside, exercising, participating in outdoor activities, or spending extended periods in direct sunlight.
Heat Can Build Quickly
The hottest conditions are expected during the afternoon and into the evening.
However, heat-related stress does not necessarily begin at the day’s maximum temperature. Repeated exposure to high temperatures can cause the body to accumulate heat, especially when people do not take sufficient breaks or replace fluids.
For that reason, outdoor activities should be planned around cooler portions of the day whenever possible.
Cities to Watch
Rio Grande Valley
Communities including McAllen, Edinburg, Pharr, Mission, Weslaco, Rio Grande City, and Roma could experience oppressive heat and humidity.
Residents should limit prolonged outdoor activity during the hottest part of the afternoon and make sure adequate drinking water is available.
Cameron and Willacy County Areas
The heat threat also extends toward Brownsville, Harlingen, Raymondville, Port Isabel, Laguna Vista, and Port Mansfield.
Coastal locations can experience high humidity, meaning temperatures may feel considerably hotter despite proximity to the Gulf of Mexico.
Brooks and Kenedy County Areas
Farther north and west, Falfurrias and Sarita are also included.
These areas can experience intense afternoon heating, making hydration and regular cooling breaks particularly important for anyone working or traveling outdoors.
Heat Safety Tips
The National Weather Service recommends drinking plenty of water, wearing lightweight and light-colored clothing, and taking frequent breaks from the heat. (National Weather Service)
Radar Watch HQ recommends the following precautions:
Stay Hydrated
Drink water regularly rather than waiting until you become extremely thirsty. People participating in prolonged outdoor activities may need additional fluids.
Take Frequent Breaks
Move into air conditioning, shade, or another cool environment whenever possible.
Dress for the Heat
Choose loose-fitting, lightweight and light-colored clothing that allows the body to release heat more effectively.
Never Leave Children or Pets in Vehicles
A parked vehicle can become dangerously hot in a short period of time. The National Weather Service specifically warns that young children and pets should never be left unattended in vehicles. (National Weather Service)
Check on Vulnerable People
Older adults, young children, outdoor workers and people spending extended periods outside can be particularly vulnerable during periods of extreme heat.
Heat Awareness Across Deep South Texas
The current Special Weather Statement comes as the National Weather Service’s Brownsville/Rio Grande Valley office continues to highlight significant heat concerns across Deep South Texas. Its current briefing indicates an Extreme Heat Risk for populated portions of Cameron, Hidalgo, Starr and Zapata counties, with a Major Heat Risk across much of the remainder of Deep South Texas. (National Weather Service)
That broader heat pattern reinforces the importance of treating today’s conditions seriously, even in areas where a formal warning has not been issued.
What Residents Should Do Today
Before heading outside, check the latest weather conditions and plan activities around the heat.
If you must work or exercise outdoors, schedule frequent cooling breaks, drink water consistently and watch for signs of heat-related illness.
Symptoms such as headache, dizziness, weakness, nausea, heavy sweating or confusion should not be ignored. Move to a cooler environment and seek appropriate medical assistance when necessary.
Radar Watch HQ Final Thoughts
Today’s Special Weather Statement is a reminder that dangerous heat does not require record-breaking temperatures to become a serious threat.
Across the Rio Grande Valley and coastal South Texas, the combination of heat and humidity will make conditions feel significantly hotter this afternoon and evening. With heat index values potentially reaching or exceeding 111 degrees in some locations, residents should take hydration, shade and cooling breaks seriously.
Stay weather-aware, protect yourself from prolonged heat exposure, and check on those who may be more vulnerable to extreme temperatures.
Radar Watch HQ will continue monitoring weather conditions across South Texas and the Rio Grande Valley as conditions evolve.
Radar Watch HQ Top 5 Essentials for Extreme Heat
Affiliate Disclosure: As an Amazon Associate, Radar Watch HQ earns from qualifying purchases.
When an Extreme Heat Watch or Heat Advisory is in effect, having the right gear can help you stay safer and more comfortable.
A compact, battery-powered fan provides cooling while traveling, working outdoors, waiting at events, or during power outages.
2. Insulated Water Bottle or Tumbler
A high-quality insulated bottle or cup keeps water cold for hours, making it easier to stay hydrated throughout the day.
A handheld misting fan or spray bottle delivers instant cooling by combining fine water mist with airflow.
Portable air conditioners, evaporative coolers (where appropriate), or high-performance tower fans can help reduce indoor temperatures during dangerous heat.
5. Electrolyte Hydration Packets or Drinks
Electrolyte supplements help replace minerals lost through heavy sweating and support hydration during prolonged heat exposure.
