Houston’s summer heat isn’t just uncomfortable — it’s dangerous. And most people are looking at the wrong number.
While residents check the forecast or feel-like temperatures before heading outside, health experts say there’s a far more accurate measure of heat danger — one that most people have never heard of. And right now, it’s sitting in the red zone across Southeast Texas.
Heat kills more Americans than any other weather event
Extreme heat is the leading cause of weather-related deaths in the United States. The CDC estimates roughly 1,220 Americans die from it every year — more than hurricanes, tornadoes, or floods.
In Houston, the danger is multiplied by humidity. When the air is thick with moisture, your body can’t cool itself efficiently. Your heart works harder. Your kidneys are under pressure. Sweat — your body’s natural defense — stops doing its job.
Why the heat index misses the point
The “feels like” temperature factors in humidity, but it’s calculated in the shade. For anyone standing in direct sunlight — outdoor workers, athletes, kids at the park, or fans at FIFA World Cup events — that number significantly underestimates the real danger.
The number that actually matters
Wet bulb globe temperature measures how well your body can actually cool itself outdoors. It accounts for air temperature, humidity, wind speed, sun angle, and solar radiation all at once.
Right now, wet bulb globe temperatures across the Houston area are projected to reach 88–90°F through the end of the month — placing the entire region in the high-risk category.
At that level, heat stress builds fast. Experts recommend resting up to 40 minutes out of every hour when working or exercising outside.
What you should do
- Stay out of direct sun between 10 a.m. and 4 p.m.
- Hydrate before you feel thirsty
- Check on elderly neighbors and outdoor workers
- Do not leave children or pets in parked vehicles — ever
If someone shows signs of heat stroke — confusion, hot dry skin, or loss of consciousness — call 911 immediately.
