HOUSTON – Every summer, Houstonians brace for the same thing: brutal heat mixed with thick, sticky humidity that makes even a short walk outside feel exhausting.
Now, doctors at Houston Methodist say that humidity does far more than just make people uncomfortable, it can affect breathing, strain the heart and even impact mental health.
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In an article published by Houston Methodist, cardiologist-scientist Dr. Sadeer Al-Kindi explained that high humidity makes it harder for the body to cool itself, increasing the risk of dangerous heat-related illnesses like heat exhaustion and heat stroke.
“High humidity can impair the body’s ability to cool itself,” Al-Kindi said, noting that humid conditions combined with extreme heat can also increase the risk of heart attacks, strokes and irregular heart rhythms.
Why Houston’s humidity feels so brutal
Houston’s location near the Gulf Coast gives the city some of the highest summer dew points in Texas. According to Houston Methodist, Houston averages a summer dew point of 73.7 degrees, a level considered oppressive.
Humidity becomes dangerous because sweat cannot evaporate efficiently. That means the body struggles to cool down naturally, causing people to overheat faster.
The result? Many Houstonians experience fatigue, dizziness, nausea and dehydration after spending too much time outdoors.
On social media, longtime Houston residents say the city’s summer weather feels unbearable at times.
In one Reddit thread discussing Houston heat, users described summer as “pre-heating” before the worst arrives in July and August, while others said the humidity feels worse than ever.
Humidity can trigger breathing problems
Doctors say humidity can also worsen respiratory conditions like asthma and allergies.
Humid air creates ideal conditions for mold, dust mites and pollen to thrive, which can aggravate symptoms for people with asthma or chronic lung disease.
Houston Methodist doctors warn that muggy conditions can narrow airways and make breathing feel more difficult — especially for vulnerable groups such as children, seniors and people with underlying health conditions.
Your heart works harder in humid weather
According to Houston Methodist, the heart can work two to four times harder in hot, humid conditions as the body attempts to regulate temperature.
That extra strain can become dangerous for people with high blood pressure or heart disease.
Doctors say some medications can also increase sensitivity to heat, making it even more important for people to stay hydrated and avoid prolonged outdoor activity during peak afternoon temperatures.
Humidity May even affect mental health
Houston Methodist also pointed to research showing humidity may contribute to anxiety, irritability and depressive symptoms.
Doctors say hot, sticky weather can interfere with sleep, reduce motivation and increase stress levels.
Some Houstonians online say the endless summer heat impacts their mood every year. In another Reddit discussion, residents talked about experiencing summer seasonal depression and feeling emotionally drained during long stretches of extreme heat and humidity.
How doctors say Houstonians can stay safe
Houston Methodist experts recommend several ways to protect yourself during Houston’s humid summer months:
- Drink plenty of water, even if you don’t feel thirsty
- Limit outdoor activity during the hottest parts of the day
- Wear lightweight, breathable clothing
- Stay in air-conditioned spaces when possible
- Take frequent breaks if working outdoors
- Watch for signs of heat illness, including dizziness, nausea and confusion
Doctors also encourage people to pay attention to the heat index, not just the air temperature, because humidity can make it feel significantly hotter outside.
For many Houstonians, the sticky summer air is simply part of life. But medical experts say ignoring the effects of humidity can put your health at risk.