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 about the weather, here’s an easy-to-read guide to when each U.S. state is most humid.
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!
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.
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.
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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.
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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.
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!