Why Does Humidity Make You Sweat? We Find Out

Humidity can be uncomfortable, leaving us feeling sticky and sweaty with frizzy hair, and foggy glasses, and can even make it difficult to breathe. But why does humidity make you sweat?

Humidity makes you more aware of your sweating because there is so much moisture in the air that when you do sweat, it doesn’t evaporate effectively enough to make you feel cool. That sweaty, sticky, wet feeling is very uncomfortable and also very common in humid conditions.

Does Humidity Make You Sweat?

You’re out for a run in hot, muggy weather. You’ve been going for about 15 minutes, and you can feel the sweat dripping down your back. Suddenly, you feel like you can’t breathe.

You start to feel lightheaded and dizzy, so you stop and lean against a tree to catch your breath.

During days like this, you can’t help but wonder why you sweat so much on humid days.

Because humid air is so saturated with moisture, your sweat doesn’t evaporate efficiently to cool you off. That’s why you feel hotter and stickier on humid days. Humid air is also harder to breathe, which can be a problem if you have asthma.


To understand sweating, it’s important to first understand humidity. Humidity is the amount of water vapor in the air, and it can have a big impact on how much we sweat.

That’s because when the air is humid, our sweat doesn’t evaporate as quickly as it does when it’s dry. This makes us feel hotter and more uncomfortable.

So next time you’re out on a hot, sticky day, remember that there’s science behind why you’re sweating.

Why Does Humidity Make You Sweat?

Sweating is the body’s response to overheating and it happens when the temperature of the body rises and the sweat glands start to produce sweat.

The sweat then evaporates, which helps to cool the body down. However, humid conditions can interfere with this process.

When the air is already saturated with water, it makes it harder for the sweat to evaporate. As a result, people can end up feeling much hotter than they would if the air was dry.

So, to answer the question, yes, humidity does make you sweat.

Do You Sweat in Dry Heat?

When the weather is hot and dry, your body still needs to cool itself off and will sweat in order to do so. You may not sweat as much as you would if the weather was humid because humid air can hold more moisture. Dry air will evaporate your sweat more quickly, meaning you won’t feel as wet.

Sweating is one of the body’s ways of cooling itself down and regulating its temperature, so even in dry heat, you’ll still perspire when it’s hot outside.

Is Humid Heat More Dangerous?

While both humid and dry heat can be dangerous, humid heat is often more dangerous because it makes it harder for the body to cool down. When the air is humid, sweat doesn’t evaporate as quickly, which means that the body’s natural cooling system isn’t as effective.

In addition, humid air is often heavier and more stagnant, making it difficult to breathe.

When the body is unable to cool itself effectively, it is at risk of heat exhaustion or heat stroke requiring immediate medical attention.

While both humid and dry heat can be dangerous, humid heat poses a greater risk to the body’s health and well-being.

Effects of High Humidity on the Body

High humidity can have various effects on the human body causing skin irritation, as sweat does not evaporate as quickly in humid environments. This can lead to rashes or other skin conditions. In extreme cases, it can also lead to heat exhaustion or heat stroke.

Humidity can also make it difficult to breathe, as the air is heavier with more moisture. This can be especially harmful to people with asthma or other respiratory conditions.

High humidity levels can also encourage the growth of mold and mildew, which can cause respiratory problems.

Therefore, it is important to stay cool and dry in high-humidity environments.

Sweating and Dehydration

Sweating is the body’s natural way of cooling itself down. When we exercise or are in a hot environment, our body temperature rises and we start to sweat. Sweat is mostly made up of water and salt, which helps to regulate our body temperature and keep us from overheating.

However, excessive sweating also causes us to lose important electrolytes like sodium and potassium.

If we sweat too much without replacing these electrolytes, we can become dehydrated. Dehydration can lead to fatigue, muscle cramps, dizziness, and nausea.

In extreme cases, it can even be life-threatening. Therefore, it’s important to stay hydrated by drinking plenty of fluids when sweating excessively.

Plain water is the best choice for rehydrating, but sports drinks can also help to replenish electrolytes.

So next time you break a sweat, make sure to drink up.

Can Humidity Make You Dizzy?

When the relative humidity is high, it can feel muggy or oppressive causing some people to feel dizzy. This is because high humidity can lead to dehydration, which can cause dizzy spells. When the air is very humid, it can be difficult to breathe, making people feel lightheaded or dizzy.

If you are feeling dizzy due to humidity, it is important to drink plenty of fluids and take a break from physical activity until you start to feel better.

Humidity is the amount of water vapor present in the air and is measured in relative humidity.

This means the amount of water vapor present in the air relative to the amount of water vapor needed for saturation at a given temperature.

When the relative humidity is high, it can feel muggy or oppressive. In some cases, it can also cause people to feel dizzy.

If you are feeling dizzy due to humidity, it is important to drink plenty of fluids and take a break from activities until you start to feel better.

At What Humidity Does Sweat Stop Evaporation?

The humidity at which sweat stops evaporating is called the dewpoint. The dewpoint is the temperature to which air must be cooled at a constant pressure in order for water vapor to condense on a surface. The dewpoint is lower than the air’s actual temperature when the humidity of the air is high.

Conversely, the dewpoint is higher than the air’s actual temperature when the humidity is low.

When the dewpoint and air temperature are equal, relative humidity is 100%. At this point, water vapor is saturating the air and sweat can no longer evaporate.

However, evaporation can still occur if the dewpoint is below the freezing point of water (0 degrees Celsius or 32 degrees Fahrenheit).

In this case, sweat will evaporate, but it will instantly turn to ice.

Why Does Humidity Drain You?

Relative humidity, or the amount of water vapor in the air compared to the maximum amount of water vapor the air can hold at a particular temperature, affects how comfortable humans feel. Low relative humidity can cause mucous membranes to dry out, leading to nosebleeds and respiratory problems.

If the relative humidity is too high, it can make it difficult for sweat to evaporate, which is our body’s natural cooling mechanism.

When we can’t cool ourselves effectively, we feel hot and exhausted. So while low humidity can be uncomfortable, high humidity levels are downright draining.

To stay comfortable, the ideal relative humidity should be between 30 and 50 percent humidity.

Why Do We Sweat a Lot on Hot Days?

The human body is equipped with a natural cooling system that helps regulate the body’s core temperature. When we get too hot, the brain triggers the release of sweat from the sweat glands. As the sweat evaporates, it helps to cool the skin and the blood flowing within the blood vessels beneath it.

This process is most effective on hot days when there is a lot of evaporation.

However, sweating can also be triggered by other factors, such as exercise, emotions, or spicy food.

In these cases, sweat serves to regulate body temperature but may not be as effective in cooling the body down.

How to Stop Sweating in Humid Weather

If you’re struggling to keep your cool in humid weather, there are a few things you can do to stop sweating. First, try to avoid heat-triggering foods and drinks like caffeine, alcohol, and spicy dishes. These can all cause your internal temperature to rise and make you sweat more.

Instead, opt for milder foods and beverages like watermelon, cucumber soup, or mint iced tea.

You should also dress for the weather by wearing light, breathable fabrics like cotton and linen.

And don’t forget to apply an antiperspirant or deodorant before you head out; it’ll help keep sweat and odor at bay.

With these tips, you’ll be able to stay dry all day long; even when it’s hot and sticky outside.

Do You Sweat More in Humid or Dry Weather?

Humid weather will cause more sweating than dry weather because the moisture in the air makes it harder for the sweat to evaporate and cool the body. However, there are other factors that can affect sweating, such as exercise and stress levels.

As a result, it is difficult to say definitively that one type of weather causes more sweating than another.

Ultimately, it is important to stay hydrated and cool down in whatever weather you may find yourself in.

Final Thoughts

In conclusion, humidity and sweating are closely related. When the air is humid, it can cause our bodies to sweat more in order to regulate our temperature.

However, too much sweat can lead to dehydration, which can be dangerous.

Therefore, it is important to stay hydrated and cool in humid, hot weather. By taking some simple precautions, we can avoid problems associated with excessive sweating.


Trina Greenfield, Author
SmackDown Media LLC

About the Author:
Trina Greenfield, the owner of SmackDown Media LLC, is passionate about providing information to those interested in the air quality in and around their homes. Trina writes content about things she’s passionate about, such as safe, in-home air, educational platforms for children and adults, as well as all things family-related.