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With warm waters, stunning coral reefs, and an abundance of marine wildlife, Hawaii offers some of the best scuba diving in the world. But with varying conditions throughout the year, when is the optimal time to plan your Hawaiian dive trip?

If you’re short on time, here’s a quick answer: Late spring through early fall offers the warmest water temperatures, best visibility, and highest chance of spotting megafauna like whales, dolphins, and manta rays in Hawaii. The summer months of June through August are peak season with more crowds and higher costs, while May and September offer a balance of great conditions with fewer tourists.

Hawaii’s Dive Seasons

Winter: December to February

Winter in Hawaii brings cooler temperatures and occasional rain showers, making it a great time for diving. The water temperature during this season averages around 75°F (24°C), which is still comfortable for most divers.

The visibility is usually excellent, ranging from 80 to 100 feet (24 to 30 meters), allowing you to explore the vibrant marine life and stunning coral reefs that Hawaii is known for.

Keep in mind that winter is also the peak season for humpback whale watching, so you might even get lucky and spot these majestic creatures during your dive!

Spring: March to May

Spring in Hawaii is a transitional period where the water begins to warm up, and the marine life becomes more active. The water temperature during this season ranges from 76 to 80°F (24 to 27°C), providing a comfortable diving experience.

The visibility remains excellent, and you can expect to encounter a variety of colorful fish, sea turtles, and other fascinating marine creatures.

Spring is also a great time to explore some of the unique dive sites that are only accessible during this season, such as the manta ray cleaning stations.

Summer: June to August

Summer is a popular time for diving in Hawaii, thanks to its warm waters and calm surface conditions. The water temperature during this season averages around 82°F (28°C), making it ideal for divers who prefer warmer temperatures.

The visibility remains excellent, allowing you to fully immerse yourself in the underwater world.

Summer is also the peak season for spotting various species of sharks, including the majestic hammerhead shark. So if you’re looking for some adrenaline-pumping dives, this is the perfect time to visit!

Fall: September to November

Fall in Hawaii brings a transition from summer to winter, creating a unique diving experience. The water temperature during this season ranges from 78 to 82°F (26 to 28°C), providing comfortable diving conditions.

The visibility is still excellent, and you can expect to encounter an abundance of marine life, including schools of colorful fish, octopuses, and even the occasional Hawaiian monk seal.

Fall is also a great time to explore some of the lesser-known dive sites, as the crowds tend to be smaller compared to the summer months.

When planning your diving trip to Hawaii, it’s important to consider the specific dive seasons to ensure the best experience. Each season offers unique diving opportunities, and you can’t go wrong no matter when you choose to visit.

So pack your gear, get ready for some unforgettable dives, and immerse yourself in the beauty of Hawaii’s underwater world!

Also read: What Is The Weather Like In Hawaii?

Best Time for Big Animal Encounters

Humpback Whales: January to March

If you’re a fan of majestic marine creatures, then visiting Hawaii between January and March is an absolute must. During this time, the waters around the islands become a playground for humpback whales.

These magnificent creatures migrate from the cold Alaskan waters to the warm Hawaiian waters to breed and give birth to their calves. Witnessing the acrobatic displays of these gentle giants is an awe-inspiring experience that you won’t soon forget.

Manta Rays: May to October

To catch a glimpse of one of the most graceful creatures of the ocean, plan your dive in Hawaii between May and October. During these months, the manta rays make their appearance in the waters surrounding the islands.

These gentle giants can have wingspans of up to 20 feet, and watching them glide effortlessly through the water is truly mesmerizing.

Night dives are particularly popular for manta ray encounters, as they are attracted to the lights that illuminate the water, creating a magical and unforgettable experience.

Spinner Dolphins: Year-round

Hawaii is home to a resident population of spinner dolphins, and they can be found in the waters around the islands all year round. These playful and acrobatic dolphins are known for their spinning leaps and flips, hence their name.

Snorkeling or diving with spinner dolphins is a fantastic way to immerse yourself in their world and witness their playful antics up close.

Keep in mind that it’s important to respect their natural habitat and give them space while enjoying this unique encounter.

For more information on the best time to dive in Hawaii and to plan your underwater adventure, check out the official website of the Hawaii Tourism Authority:

Also read: How Much Is Snorkeling In Hawaii? A Detailed Cost Breakdown

Water Temperatures Throughout the Year

One of the key factors to consider when planning a dive in Hawaii is the water temperature. The tropical climate of the islands ensures that the water is generally warm, making it an ideal diving destination year-round.

However, there are some seasonal variations that can impact your diving experience.

Winter (December – February)

During the winter months, the water temperatures in Hawaii can range from around 74°F (23°C) to 78°F (26°C). While this might be slightly cooler than other times of the year, it is still comfortable for diving.

The cooler water temperatures can also bring some benefits, such as increased visibility and the possibility of encountering larger marine life.

Also read: What Is Winter Like In Hawaii?

Spring (March – May)

In spring, the water temperatures start to rise, ranging from 75°F (24°C) to 80°F (27°C). This is a great time to dive in Hawaii as the warm water provides optimal conditions for underwater exploration.

The visibility is usually excellent during this season, allowing divers to fully appreciate the vibrant coral reefs and abundant marine life.

Summer (June – August)

Summer is considered the peak diving season in Hawaii, with water temperatures ranging from 78°F (26°C) to 82°F (28°C). The warm water makes it comfortable for divers to spend extended periods underwater, and the visibility is often at its best.

It’s also worth noting that this is the busiest time of year for diving, so it’s advisable to book your dives in advance.

Fall (September – November)

During the fall season, the water temperatures in Hawaii range from 76°F (24°C) to 80°F (27°C). This is still a fantastic time to dive, as the water remains warm and the visibility remains excellent. The fall months are also less crowded compared to the summer, making it a great time to explore the underwater world at a more relaxed pace.

It’s important to note that these temperature ranges are approximate and can vary depending on the specific location and year. It’s always a good idea to check the current water temperatures before your dive to ensure you are properly prepared.

For more detailed and up-to-date information on water temperatures in Hawaii, you can visit the Hawaii News Now website or consult with local dive operators who have firsthand knowledge of the conditions in each area.

Also read: When Is The Best Time To Visit Hawaii? A Local’S Guide

Crowds and Costs

When planning your dive in Hawaii, it’s important to consider both crowds and costs. These factors can greatly impact your overall experience and enjoyment of your dive. Here are some things to keep in mind:


Hawaii is a popular destination for divers from all over the world, so it’s no surprise that certain dive sites can get crowded, especially during peak travel seasons.

If you prefer a more peaceful and less crowded experience, it’s best to avoid diving during major holidays or school vacation periods. During these times, dive sites can be crowded with tourists, making it more difficult to fully appreciate the beauty of the underwater world.

One way to beat the crowds is to consider diving during the shoulder seasons, which are the periods just before and after the peak travel seasons.

During these times, you’ll still get to enjoy the beautiful marine life and stunning dive sites, but with fewer people around. This can also give you the opportunity to dive with more experienced divers and have a more personalized experience.


The cost of diving in Hawaii can vary depending on several factors, including the dive operator you choose, the type of dive you want to do, and any additional equipment or certifications you may need. It’s important to do your research and compare prices from different dive operators to ensure you’re getting the best value for your money.

Additionally, keep in mind that certain dive sites may require permits or fees, so be sure to factor these costs into your budget. Some popular dive sites, like Molokini Crater, require a permit and have limited daily access, so it’s important to plan ahead and make any necessary reservations.

By considering both crowds and costs when planning your dive in Hawaii, you can ensure a more enjoyable and budget-friendly experience. Remember to book your dive in advance, choose the right time to visit, and dive responsibly to help preserve the beautiful marine ecosystem of Hawaii.

Also read: How Expensive Is Hawaii? A Detailed Look At The Costs

Diving Conditions by Island


Oahu, the most populous island in Hawaii, offers a variety of diving experiences for both beginners and advanced divers. The island’s calm and clear waters make it an ideal location for beginners to learn and explore.

Popular dive sites on Oahu include Hanauma Bay, where you can swim with colorful fish and explore coral reefs, and the wreck of the YO-257, a sunken ship filled with marine life.

The best time to dive on Oahu is during the summer months when the waters are calm and visibility is at its best.


Maui, known as the “Valley Isle”, is a diver’s paradise with its diverse marine life and stunning underwater landscapes. One of the most famous dive sites on Maui is Molokini Crater, a partially submerged volcanic crater that offers crystal clear waters and a plethora of marine species.

Another popular spot is the Cathedrals at Lanai, where divers can explore underwater lava tubes and swim among sea turtles. The best time to dive on Maui is during the spring and fall months when the water temperature is warm and visibility is excellent.


Kauai, also known as the “Garden Isle”, offers unique diving experiences with its dramatic underwater terrain and abundant marine life. One of the highlights of diving in Kauai is the opportunity to explore underwater caves and lava tubes.

Tunnels Beach is a popular dive site on the north shore of the island, where divers can swim through tunnels and encounter tropical fish and green sea turtles. The best time to dive on Kauai is during the summer months when the waters are calm and the visibility is good.

Big Island

The Big Island of Hawaii is home to some of the most diverse and exciting diving opportunities in the state. From exploring lava tubes and underwater lava formations to swimming with manta rays and dolphins, there is something for every diver on the Big Island.

The Kona Coast is particularly renowned for its night dives, where you can witness the mesmerizing spectacle of manta rays feeding on plankton. The best time to dive on the Big Island is during the winter months when the water is warmer and the visibility is excellent.

Remember, before planning your diving trip, it is important to check the local weather and water conditions. Consulting with local dive operators and utilizing the resources provided by the Hawaii Department of Land and Natural Resources can help ensure a safe and enjoyable diving experience.

Also read: The Hawaiian Sport Of Surfing


To experience the best of Hawaii’s spectacular underwater scenery, marine wildlife encounters, and ideal diving conditions, plan your trip between May and October. Avoid the crowds and expenses of summer by traveling in May or September. Whenever you choose to dive, you’ll be rewarded with unforgettable adventures in Hawaii’s pristine Pacific waters.

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