Where is the wettest place in the United States? Top rankings (Updated)

When people think about rainy places in America, states like Louisiana or Florida usually come to mind first. But surprisingly, they are not the wettest place in the United States. The answer actually lies far out in the Pacific Ocean. Let’s explore rainfall patterns across the United States and rank the wettest places in the US based on annual precipitation data. 

Wettest place in the United States

Rain pattern across the US

Rainfall in the United States varies dramatically depending on geography, climate systems, and seasonal weather patterns. 

Some regions experience frequent thunderstorms and hurricanes, while others stay dry for most of the year.

The Pacific Northwest and Hawaii receive extremely high rainfall because moist ocean air is forced upward by mountains, creating heavy precipitation. 

Meanwhile, southeastern states such as Louisiana, Mississippi, and Alabama are heavily influenced by warm Gulf moisture and tropical storms.

In contrast, the Southwest remains much drier due to desert climates and rain-shadow effects caused by mountain ranges. 

States like Nevada and Arizona often record some of the lowest annual precipitation totals in the country.

If you want to know the opposite end of the spectrum, check out which US states has the least rainfall to see the driest regions in America. 

Another important factor is seasonal rainfall. Many southeastern states receive their heaviest rain during summer because of hurricanes, tropical storms, and humid air masses. 

Western mountain regions, however, may see peak precipitation during winter.

Timing is everything when it comes to weather patterns, and understanding what month does it rain the most can help you plan your travels across different states.

Rainfall in the United States varies depending on geography

Where is the wettest place in the United States?

The wettest state in the United States is Hawaii. 

Thanks to its tropical climate and mountainous landscape, Hawaii receives significantly more rainfall than any other state in the country.

Hawaii

• Annual precipitation: Around 63.7 inches per year

• Wettest month: December

• Main factor: Tropical climate and mountain-induced rainfall

Hawaii’s rainfall levels are strongly affected by trade winds coming from the Pacific Ocean. When moist air hits the islands’ mountains, it rises, cools, and produces intense rainfall. 

This process, called orographic precipitation, creates some of the rainiest locations on Earth.

Mount Waialeale on Kauai is especially famous for its incredible rainfall totals. Some years, this region receives well over 400 inches of rain, making it one of the wettest spots anywhere in the world.

Receiving over 400 inches of rainfall annually, this spot heavily influences any Hawaii high-rainfall climate forecast and remains one of the wettest places on Earth. 

Despite the heavy rainfall, Hawaii’s weather remains warm year-round, which helps create the lush rainforests, waterfalls, and tropical ecosystems the islands are known for.

Hawaii is the wettest place in the United States

5 wettest places in the US

5 wettest places in the US include Louisiana, Mississippi, Alabama, Florida, and Tennessee. 

Let's see why these states receive so much precipitation and how much rain they get each year.

Louisiana

• Annual precipitation: Around 60.1 inches per year

• Wettest month: July

• Main factor: Gulf moisture and hurricanes

Louisiana is one of the rainiest states in the mainland United States. 

Warm air from the Gulf of Mexico constantly feeds moisture into the atmosphere, creating heavy thunderstorms throughout the year.

The state is also highly vulnerable to tropical storms and hurricanes, especially during late summer. Cities near the coast often experience intense downpours and flooding during hurricane season. 

Combined with Louisiana’s low elevation and humid subtropical climate, these factors contribute to consistently high rainfall totals.

Louisiana is one of the rainiest states in the mainland United States

Mississippi

• Annual precipitation: Around 59 inches per year

• Wettest month: December

• Main factor: Humid subtropical climate

Mississippi receives abundant rainfall because of its location near the Gulf of Mexico. Moist air masses regularly move inland, producing rain across much of the state.

Thunderstorms are common during spring and summer, while winter systems can also bring steady rainfall. 

Mississippi’s forests, rivers, and fertile agricultural land are all closely tied to its consistently wet climate.

How much precipitation will Mississippi receive today, tomorrow, or over the next 10 days? 

Check the latest weather forecast on Weather365 for real-time precipitation forecasts and local weather updates.

Mississippi receives abundant rainfall

Alabama

• Annual precipitation: Around 58.3 inches per year

• Wettest month: March

• Main factor: Gulf air and storm systems

Alabama experiences frequent rainfall throughout the year, with precipitation spread fairly evenly across seasons. 

Warm Gulf moisture combines with frontal systems to create regular thunderstorms and heavy rain events.

Northern Alabama can also receive rainfall from storm systems moving eastward across the country.

The state’s varied terrain slightly enhances rainfall totals in some higher-elevation regions.

Alabama experiences frequent rainfall throughout the year

Florida

• Annual precipitation: Around 54.5 inches per year

• Wettest month: August

• Main factor: Tropical storms and summer thunderstorms

Florida’s climate is heavily influenced by warm ocean waters surrounding the state.

During summer, intense daytime heating creates powerful thunderstorms almost every afternoon in many areas.

Hurricane season also contributes enormous amounts of rainfall.

Tropical cyclones can produce several inches of rain within a short period, leading to flash flooding and saturated ground conditions.

Southern Florida, in particular, sees very humid conditions for much of the year.

Many powerful thunderstorms occur in Florida

Check current weather forecast in Florida right now!

Tennessee

• Annual precipitation: Around 54.2 inches per year

• Wettest month: March

• Main factor: Mountain geography and moist air

Tennessee may surprise many people on this list, but the state receives substantial rainfall because of its geographic position and mountain influences.

Moist air from the Gulf of Mexico often moves northward into the region.

When these air masses interact with the Appalachian Mountains, rainfall becomes even more intense in eastern Tennessee.

The state also experiences frequent spring storms and occasional remnants of tropical systems moving inland from the Gulf Coast.

Tennessee receives heavy rainfall due to its location

US States have most often rain and snow 

Some states not only receive large amounts of precipitation but also experience rain or snow very frequently throughout the year.

States in the Northeast and Pacific Northwest often record the highest number of wet days annually. 

Areas around the Great Lakes and mountain regions can also experience frequent snowfall during the winter months.

For example, parts of New York, Washington, and Alaska regularly see precipitation on more than 150 days each year. 

Coastal and mountainous climates play a major role in creating these long wet seasons.

Meanwhile, southeastern states may receive higher overall rainfall totals but often in shorter, more intense storms rather than continuous wet days.

Understanding both precipitation totals and precipitation frequency, as well as how meteorologists calculate the probability of precipitation, helps paint a more complete picture of America’s wettest climates.

Check New York’s current precipitation on Weather365!

US States experiences frequent snow throughout the year

Wrap up

Where is the wettest place in the United States? The answer is Hawaii, which easily ranks as the wettest state thanks to its tropical climate and mountainous terrain. However, several southeastern states like Louisiana, Mississippi, and Alabama also receive extremely high rainfall totals every year.