Discover the Most and Least Humid States in US 2025

When you think of summer, heat is probably the first thing that comes to mind. However, in many parts of the United States, it’s the humidity that truly defines the season’s comfort—or discomfort. Humidity levels vary dramatically across the country, influencing everything from how you feel outside to the air quality inside your home. This guide will explore the states with the highest and lowest average humidity, helping you understand the diverse climates across the nation.

Ranking of States by Humidity from Highest to Lowest

Understanding which states are the most humid requires looking at a couple of key metrics. The most common is average relative humidity, which measures the amount of moisture in the air compared to the maximum it can hold at a specific temperature. Another important factor is the average dew point; when the dew point is high, the air feels much stickier and more uncomfortable.

The most humid states consistently top the charts in both categories. These locations, often near large bodies of water, experience that thick, heavy air that makes summer days feel so stifling. Below is a look at the states with the highest average humidity, giving you a clear picture of where moisture reigns supreme.

State	Average Humidity
Alabama	77.1%
Florida	74.5%
Louisiana	74%
Mississippi	73.6%
Hawaii	73.3%

Ranked List of the Most and Least Humid States in the US for 2025

Now that you have an idea of how humidity is measured, let’s look at the specific states at both ends of the spectrum. This ranking is based on data including average relative humidity and other climate factors that contribute to how humid a state feels year-round.

We will explore the top five most humid states, where the air is often thick with moisture, followed by the five least humid states, where dry conditions are the norm. This detailed list will give you a better grasp of the differing humidity levels across the country.

1. Florida – The Most Humid State in 2025

Florida’s reputation as a hot and humid state is well-deserved. Surrounded by water and experiencing tropical weather patterns, it consistently ranks near the top for high humidity. The combination of warmth and moisture creates the sticky, oppressive feeling the Sunshine State is famous for, especially during the summer months.

This humid state has an average humidity of 74.5%, but its dew point tells an even bigger story. The high dew point is a better indicator of how uncomfortable the air feels, and Florida’s is one of the highest in the country. This means the air is frequently saturated with moisture, making it difficult for your body to cool itself.

• It has the second-highest average dew point in the nation at 62.74°F.
• Four of the top ten most humid cities in the US are in Florida.
• The state’s peninsula geography contributes significantly to its humid conditions.

2. Louisiana – High Humidity All Year Round

Positioned along the Gulf of Mexico, Louisiana is no stranger to high humidity. The state’s climate is heavily influenced by the warm waters of the Gulf, which feed a large amount of water vapor into the atmosphere. This results in humid conditions that persist for most of the year, not just during the summer.

The state’s average dew point is a high 58.3°F, contributing to the muggy feeling that defines its climate. Louisiana’s largest city, New Orleans, even holds the title for the highest average relative humidity among all major US cities. If you’re living in or visiting Louisiana, expect the air to feel thick and heavy.

• Louisiana’s average humidity is 74%, making it one of the top three most humid states.
• Its proximity to the Gulf of Mexico ensures a constant supply of moisture.
• New Orleans has an average relative humidity of 75.9%.

3. Mississippi – Consistently Moist Conditions

Just like its neighbors, Mississippi experiences consistently moist conditions due to its location near the Gulf of Mexico. The state’s humidity levels are among the highest in the nation, creating a climate where the air is almost always damp. This persistent moisture affects everything from daily comfort to the need for home maintenance.

Mississippi ranks fourth in the US for both average relative humidity and average dew point. These high rankings confirm what residents already know: summers are sticky, and even the cooler months can feel damp. The state’s climate is a classic example of the humid subtropical conditions found across the Deep South.

• The average relative humidity in Mississippi is a high 73.6%.
• It has an average dew point of 55.8°F, indicating very muggy conditions.
• These consistently high humidity levels make it one of the states with the worst summer humidity.

4. Hawaii – Tropical Humidity Influences

As a chain of islands in the middle of the Pacific Ocean, it’s no surprise that Hawaii has significant tropical humidity. The surrounding warm ocean waters provide a constant source of moisture, which is carried over the islands by trade winds. This results in high humidity levels year-round, a key feature of its tropical climate.

What truly sets Hawaii apart is its average dew point, which is the highest in the entire country at 65.2°F. This exceptionally high dew point means the air feels incredibly saturated with moisture, even if temperatures aren’t extreme. The state’s average relative humidity is also quite high, adding to the overall damp feeling.

• Hawaii has the highest average dew point in the United States.
• Its average relative humidity is 73.3%, placing it in the top five most humid states.
• The tropical island geography is the primary factor behind its constant humidity.

5. Alaska – Surprisingly High Average Humidity

You might be surprised to see Alaska on a list of humid states. While it’s known for cold temperatures, Alaska actually has a high average humidity. Relative humidity is a measure of moisture relative to what the air can hold, and cooler air reaches its saturation point with less water vapor than warm air.

Because of its cold climate, the air in Alaska is often near its maximum capacity for holding moisture, leading to high relative humidity readings. The state also has a surprisingly high average dew point, ranking fifth in the nation. This means that while it doesn’t feel sticky and hot like Florida, the humidity levels are still significant.

• Alaska ranks fifth in the US for the highest average dew point at 54°F.
• The state’s cooler air can’t hold much moisture, leading to a high relative humidity.
• It is considered one of the more humid states, challenging common perceptions.

6. Nevada – The Least Humid State in 2025

On the opposite end of the humidity spectrum lies Nevada. As the driest state in the nation, it is known for its exceptionally low humidity. This is largely due to its geographic location in the arid Great Basin and its distance from major sources of moisture like the Pacific Ocean, with mountain ranges blocking incoming moisture.

The result is an environment dominated by dry air. If you’ve ever experienced a hot day in Nevada, you’ve likely noticed the lack of stickiness in the air. This arid air allows sweat to evaporate quickly, making high temperatures feel more tolerable than in humid climates. Nevada is a prime example of the least humid states in the US.

• It is widely recognized as the state with the lowest humidity.
• Its desert landscape and inland location contribute to its arid air.
• Low humidity makes the climate feel much different from the muggy conditions in the South.

7. Arizona – Dry Desert Air Prevails

Arizona is famous for its “dry heat,” a term that perfectly captures its climate. The state’s deserts and arid regions contribute to some of the lowest relative humidity levels in the country. While temperatures can soar, the lack of moisture in the air makes the heat feel fundamentally different from the humid heat of the East Coast or Gulf states.

This dry air means you won’t experience that sticky, clammy feeling that accompanies high humidity. The body’s natural cooling mechanism, sweating, is far more effective in Arizona because perspiration evaporates almost instantly. This is a defining characteristic of life in the state’s hot, arid environment.

• Arizona is known for its low humidity and classic “dry heat.”
• Its location in the Sonoran Desert is a major reason for the dry air.
• The state’s summertime humidity is among the lowest in the nation, offering a sharp contrast to humid states.

8. New Mexico – Low Humidity Levels

Neighboring Arizona, New Mexico also boasts a climate with very low humidity levels. The state’s high elevation and continental location mean it has relatively dry summers and minimal moisture in the air throughout the year. For those looking to escape the oppressive stickiness of more humid regions, New Mexico offers a welcome reprieve.

Living in a low-humidity environment does come with its own set of considerations. The dry air can lead to issues like dry skin and chapped lips, so staying hydrated is important. However, many find this a small price to pay for the comfort of a climate free from muggy conditions.

• New Mexico is noted for its characteristically dry summers.
• The state’s geography results in consistently low humidity levels.
• While comfortable, the dry air can present challenges like dry skin.

9. Colorado – Mountainous, Dry Climate

Colorado’s mountainous terrain and high elevation are key contributors to its dry climate. The state is known for its dry summers, where the air is crisp and comfortable, even on hot days. The elevation helps keep humidity low, and the excellent air circulation in the mountains further prevents moisture from building up.

In this dry environment, the evaporation of sweat is highly efficient, allowing your body to cool itself effectively. This is why a 90°F day in Denver can feel much more pleasant than an 85°F day in a humid coastal city. The state is home to major cities like Denver and Colorado Springs, which enjoy these comfortable, low-humidity conditions.

• High elevation and an inland location create a naturally dry climate.
• The air allows for efficient evaporation of sweat, making heat more tolerable.
• Mountainous geography promotes good air circulation, keeping the air fresh and dry.

10. Utah – Arid Air and Minimal Moisture

Utah is another state defined by its arid air and minimal moisture. Much of the state is part of the Great Basin, a large, dry region in the western US. This geography ensures that the measure of moisture in the air remains low throughout the year, resulting in a climate characterized by dry heat.

Similar to its neighbors, Utah’s climate makes it one of the least humid states in the US. Residents experience hot summers without the oppressive stickiness found in more humid areas. The arid air is a defining feature of daily life, influencing everything from outdoor activities to the need for a good moisturizer.

• The state is characterized by minimal moisture and a classic dry heat.
• Its location within the arid Great Basin region keeps humidity levels low.
• Utah’s arid air contributes to its ranking as one of the nation’s least humid states.

Wrapping Up

In summary, understanding the humidity levels across the United States provides valuable insights into daily life and comfort. From the sweltering heat of Florida to the arid air of Nevada, each state presents its unique challenges and benefits related to humidity. These factors can influence everything from health and comfort to lifestyle choices and outdoor activities. As you plan your travels or consider relocating, being informed about the humidity rankings will help you make better decisions. If you want to dive deeper into how humidity affects you personally or explore tailored solutions, we invite you to get in touch for a free consultation!