All States in the U.S. and When It’s Most Humid

Humidity. It’s that heavy, sticky feeling in the air that makes hot days feel even hotter — and sometimes downright unbearable. If you’ve ever stepped outside and felt like you walked into a sauna, you’ve experienced high humidity.

But did you know that each U.S. state experiences humidity differently? From the tropical coasts of Florida to the dry deserts of Arizona, the time of year when the air is most humid varies widely.

Whether you’re planning a trip, moving to a new state, or just curious about the weather, here’s an easy-to-read guide to when each U.S. state is most humid.

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Why Does Humidity Matter?

Humidity plays a big role in how we perceive temperature. High humidity levels can make the air feel warmer than it actually is. This is because sweat doesn’t evaporate as easily, which is your body’s natural way to cool down.

There are two main ways to measure humidity:

• Relative Humidity (RH): The percentage of moisture in the air compared to what it could hold at that temperature.
• Dew Point: A more accurate measure of how “humid” it feels. Higher dew points mean more moisture.

Now, let’s dive into the states!

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Most Humid Time of Year for All 50 States

Here’s a simple list of each U.S. state and the time of year when it’s typically the most humid.

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Alabama – July to August

Summer is hot and sticky, especially in southern Alabama. Afternoon thunderstorms add to the moisture.

Alaska – August to September

While Alaska is generally cool and dry, late summer brings more moisture, especially in coastal areas.

Arizona – July to August

The famous monsoon season hits in midsummer, bringing sudden rainstorms and a rise in humidity.

Arkansas – July to August

Summers in Arkansas are hot and humid, especially in the central and southern parts of the state.

California – July to September

Coastal areas like San Diego feel the most humidity in late summer. Inland regions stay dry most of the year.

Colorado – July to August

Mountain areas are dry, but the eastern plains can get humid during summer thunderstorms.

Connecticut – July to August

Like much of New England, Connecticut’s humid season peaks in midsummer.

Delaware – July to August

Coastal breezes don’t stop Delaware from feeling humid during the hot summer months.

Florida – July to September

Florida is the most humid state year-round. Late summer is peak sticky season, especially with daily afternoon rains.

Georgia – July to August

Georgia summers are hot and humid, especially in the southern and coastal regions.

Hawaii – August to September

Thanks to its tropical climate, Hawaii is humid year-round, but it peaks in late summer.

Idaho – December to January

Surprisingly, winter can be the most humid — though the air still feels dry due to the cold.

Illinois – July to August

Humid air moves up from the Gulf of Mexico, making summer especially muggy.

Indiana – July to August

Summertime humidity is common, especially with high dew points and afternoon showers.

Iowa – July to August

The Corn Belt gets very humid in late summer — crops release moisture, adding to the muggy air.

Kansas – July to August

Western Kansas is drier, but the eastern half gets sticky during the summer.

Kentucky – July to August

Humidity is highest in midsummer and can make the heat feel sweltering.

Louisiana – July to September

One of the most humid states, especially in the south. Coastal air and heat make it feel tropical.

Maine – July to August

Though cooler than other states, Maine still gets its share of humid days in summer.

Maryland – July to August

Humidity often combines with high heat in Maryland, especially around Baltimore.

Massachusetts – July to August

New England summers bring high humidity, especially during heat waves.

Michigan – July to August

The Great Lakes influence the humidity, especially in southern Michigan.

Minnesota – July to August

Short summers, but very humid ones. Thunderstorms and high dew points are common.

Mississippi – July to August

Hot and sticky all summer long — expect high humidity across the entire state.

Missouri – July to August

Central location means moisture from both the Gulf and local rainfall adds to the humidity.

Montana – December to January

Despite its dry reputation, colder air can hold less moisture, making winter the most humid by relative standards.

Nebraska – July to August

Summers are hot and humid, particularly in the eastern regions.

Nevada – July to August

Most of the year is dry, but the monsoon season brings short bursts of humidity.

New Hampshire – July to August

Short but humid summers — especially in the southern half of the state.

New Jersey – July to August

Sticky air often lingers, especially near the coast.

New Mexico – July to August

Another dry state that gets temporary humidity during summer monsoon rains.

New York – July to August

Big cities like NYC trap humidity, while upstate sees sticky summer weather too.

North Carolina – July to August

Hot, humid, and rainy in the summer, especially in the coastal areas.

North Dakota – July to August

Humidity is relatively low overall, but it peaks in midsummer.

Ohio – July to August

Summers can feel tropical thanks to moisture from the south and local weather patterns.

Oklahoma – July to August

Summer is a mix of heat, humidity, and occasional severe storms.

Oregon – December to January

Coastal and western Oregon are most humid during the wet winter months.

Pennsylvania – July to August

Humidity is common across the state in summer, especially in the southeast.

Rhode Island – July to August

Summers bring high dew points, especially in coastal towns.

South Carolina – July to August

One of the more humid states, especially along the coast in midsummer.

South Dakota – July to August

Mostly dry, but humid in late summer during thunderstorms.

Tennessee – July to August

Expect thick, muggy air in the summer — especially in central Tennessee.

Texas – July to September

The Gulf Coast is humid year-round, but inland areas peak in late summer.

Utah – July to August

Normally dry, but can feel muggy during late-summer monsoon rains.

Vermont – July to August

Short, warm, and humid summers — especially in the valleys.

Virginia – July to August

Warm ocean air and storms make summer very humid, especially in the east.

Washington – December to January

The west coast is damp in winter, while eastern Washington is drier.

West Virginia – July to August

Humidity builds in the summer, especially in valleys and lower elevations.

Wisconsin – July to August

Warm and humid weather is common during the brief summer.

Wyoming – July to August

Generally dry, but humidity ticks up during the late summer with thunderstorms.

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Final Thoughts

While summer is the most humid time in most U.S. states, each region has its own unique climate patterns. Understanding when and where humidity peaks can help you plan your travels, manage health issues like asthma, or simply prepare for sticky weather.

Whether you’re heading to the dry deserts of the Southwest or the muggy marshes of the South, knowing the humid months can help you stay comfortable and ready for whatever the weather brings!