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Underwater

There are outstanding locations for snorkeling or diving. Some are even close to the shore and not a boat necessary. Share special places you know and describe what to expect.

Big Island is one of the best places for snorkeling. Although the conditions are good year-round, the perfect season with warmest and excellent water conditions is in the late summer and early fall (August until October).

One of the best spots for snorkeling is the Mount Cook Monument. If you like to hike to this coral reef start early or late. It's pretty busy with tour boats from approximately 10 am until early afternoon. Bring enough water for the hike. Scroll down for more information about the different snorkel spots south of Kona. 

Weather Overview

Hawaii is a sunny and warm paradise with very little temperature variation throughout the seasons: Big Island Weather Guide. There is even less rain in the drier season from May until October, which makes these months even better for snorkeling. However, it's a tropical climate and some rain can always occur in Hawaii. That's the reason why the islands have a lush and green vegetation. The north and east coast get more rain than south and west which is the leeward side. The area around Kona is often foggy in the summertime. 

Water Conditions

You'll find the warmest water in late summer / early fall from August through October around 80°F (27°) degrees. It tends to drop by 6-9 degrees during winter. In winter, it’s also a little chilly in the mornings, when it’s a good idea to wear a thin neoprene wet suit top. The winter months from December to March tend to have heavy surf at times.

Seasons - Avoiding the Crowds

Fewer visitors in spring and fall: mid-April to mid-June and September (after Labor Day) to November. However, it's busier during the "Golden Week" in Japan at the end of April until the beginning of May. It gets very crowded when the Ironman takes place in October. Busy and increasing rates in summer (mid-June through August), during Christmas, New Year's Eve (mid-December until mid-January) and on Independence Day.

Bottom Line and Personal Experience

Although some months might not be ideal, you can visit the Big Island year-round for amazing snorkeling tours. Almost perfect months with fewer visitors as well as excellent water conditions are usually September and October. My visit to Hawaii was in September 2011. Kona's weather is often described as "eternal spring". Not too hot, not too cold, with some late afternoon rain showers. If you're lucky, you might get to see a rainbow! Crowds in September were fine although probably a bit higher than normal because it was the week before the big Hawaii Ironman Triathlon event. There were lots of bikers on the road training.
 

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This trip is offered year-round. Sometimes ocean conditions can spoil the trip, especially in the winter. It's a popular tour and likely to be sold out days before, particularly on weekends. 

Crowds

The popular manta tour is mostly sold out even in the shoulder season. Up to 150 people watch this awesome "dinner show" in the sea each evening. Therefore advanced booking is recommended.  Book your Manta tour hereShoulder seasons are: During spring between mid-April to mid-June and in fall from September to November. It's busier during the "Golden Week" in Japan end of April until the beginning of May. It gets very crowded when the Ironman takes place in October. Increasing rates in summer, during Christmas, New Year's Eve and on Independence Day. 

Weather and Ocean Conditions

In summer the ocean is calmer which is better for snorkeling. In the winter the surf can be higher. The island is drier from May to October. Kona is often cloudy during the summer. Rain can always occur in Hawaii especially late afternoon and in the nights. The reason that the islands have a lush and green vegetation, especially in the east and north on Big Island. The north and east coast gets more rain than south and west which is the leeward side. 

Diving in Winter
  • Hammerhead Sharks can be spotted year-round most probable encounters are in January and February.
  • Whale sharks are more likely to spot between mid-December to mid-January. 
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    Snorkel and weather conditions at the Keys

    The summer offers the flattest and clearest water for snorkelers. The downside the summer is also known for its uncomfortably high heat and humidity. In September and October, hurricanes can occur as it did last year in 2017. Much got destroyed by Irma here on the keys.

    The months from November thru April are much more pleasant, but there can be strong wind and waves which reduce visibility substantially. Cold fronts from Canada with strong winds arrive here in the winter. The temperature drops, and it gets chilly. Also, there can be days where the surf is too high for snorkeling. The worst month with strong winds is January, and it improves in March. The best month for snorkeling is May until Memorial Day. It is still not too hot, water is clearer, and accommodations are not as expensive as in the summertime. September can be a good month as well but consider it’s the hurricane season.

    Tip
    Book your snorkel trip in advance and on a windy day give them a call in the morning to get the tour confirmed: (305) 451 6300

    Avoiding crowds

    If possible stay at the keys from Monday to Friday and avoid weekends. Weekends are utterly busy, prices for hotels increase and most spots are crowded. The advantage on weekends guided trips are offered in the John Pennekamp State Park in the morning.

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    Swimming (snorkeling) or diving close to a whale shark or manta ray is an incredible once in a lifetime experience. Believe us! And the Maldives is an excellent year-round destination for sightings of manta rays and whale sharks. However, there are a few exceptions. In general, from November until April a higher number of manta rays can be spotted on the western side of the Maldive atolls. From May to October on the eastern side of the atolls, due to the high plankton concentration. Usually, you can spot manta rays and whale sharks on diving excursions as well as during a snorkeling/swimming tour. While the snorkeling tours are often popular and better suited for swimming with whale sharks and seeing them up close, diving is perfect for being close to both sea creatures. Read on for more details regarding sightings at certain atolls. One more thing: Of course there are other Maldive atolls where you can spot manta rays and whale sharks. However, the ones below are the top spots. While sightings are never guaranteed the chances are extremely high here:

    Manta Rays   Addu Atoll
    • Manta Rays: Excellent (year-round)
    • Whale Sharks: Not really
    • Diving or Snorkeling: Both. However, you need to dive to spot the manta rays (snorkeling only for other fish)


    Manta Ray (Maldives) by Ian Griffiths, CC BY
    The Addu Atoll is the southernmost atoll in the Maldives. It's an exceptional scuba diving destination. Here, you can spot manta rays year round. In fact, it's Manta heaven! The Addu Atoll is the only location in the Maldives where mantas rays with over 5 meter of wingspan are known to exist. You can also dive at the Maldives biggest wreck 'British Loyalty'. Besides manta rays, you will encounter eagle rays, sharks, turtles and generally big fish all year around. Please keep in mind that mantas are perfect to spot for divers here, but not if you're snorkeling. Certain aspects like the currents make it difficult. It's possible to spot a manta here while snorkeling but not very likely. 

    Whale Sharks South Ari Atoll
    • Whale Sharks: Excellent (year-round)
    • Manta Rays: Good (October - May)
    • Diving or Snorkeling: Both


    Whale Shark (Maldives) by Tchami, CC BY-SA
    South Ari (also Alifu Dhaalu Atoll) is one of the best places for spotting whale sharks. The sightings are excellent year-round with a peak time from August to November. Also, encounters with big pelagic fish are guaranteed most of the time in South Ari Atoll. In terms of water conditions, the best time is from December to May, even better from January - April (see below: Diving). You may also spot manta rays in South Ari during the northeast monsoon from September/October to May (the peak viewing time is February - April). In other months it's really hard to find manta rays here. 

    Whale Sharks & Manta Rays Baa Atoll – Hanifaru Bay
    • Manta Rays: Excellent (May/June - October/November)
    • Whale Sharks: Good (May/June - October/November)
    • Diving or Snorkeling: No diving! Only snorkeling allowed.


    Another outstanding place to spot whale sharks and up to 200 manta rays feeding is the Hanifaru Bay in Baa Atoll. The best time for sightings here is between May and November (some divers even recommend late July to early October): During these months the South West Monsoon causes a massive build-up of plankton, drawing in hundreds of whale sharks and manta rays. Hanifaru is an uninhabited island, and the bay is smaller than a football field. In 2009 the area became a marine protected area where fishing and boating is restricted. Diving is not permitted in Hanifaru Bay anymore! And there is a strict control for snorkeling with a limit of 5 boats and 80 visitors which are allowed to spend a maximum of 45 minutes in the Hanifaru Bay.


    Climate/Weather

    Weather in the Maldives is determined by a tropical climate. That means it's warm and humid. However, the high humidity is bearable because of the gentle and steady sea breeze. Regardless of the two monsoon seasons and the distance between north and south (about 800 km), the temperatures are quite stable. Throughout the year and the whole region, the highs reach 31°C (89°F), and the lows hover around 25°C (77°F). That means, temperatures can vary slightly depending on the season, but it's safe to say that they remain consistent year-round between 26°C (79°F) and 29°C (84°F).  More interesting is the rainfall:

    However, you should know that even in wet season, rain may spoil your trip but most of the time it doesn't. Rain showers are often brief and rain for a full week or so is unlikely. Read our season overview below for more details about the rain during the monsoons. Rainy days are also slightly different in terms of the region: In the dry season, the southern part (Addu Atoll) receives as twice as much rain than the northern and central part (Malé). For example 10 rainy days instead of 5 in February. But this only applies to the months between January and March/April. Also keep in mind, that these are usually brief rain showers. Another important aspect is the water temperature: It remains stable between 28°C and 30°C (82 - 86°F) during the whole year. Although water temperature as well as the general temperature don't vary a lot, the two monsoons bring different weather conditions in terms of rain and wind:

    • Dry Season (North East Monsoon / Winter): The dry season starts in November/December and lasts until April. It is influenced by the winter monsoon. At the beginning and at the end of the dry season expect a little more rain. The driest months are January, February, and March, but brief showers can occur. The northern and the central region experience the 'full dry season' while the southern part of the Maldives gets a little more rain during these months. The dry season also brings calm seas and either clear skies slightly clouded with beautiful formations. There is also significantly less wind, and the sea is often extremely flat.
    • Wet Season (South West Monsoon / Summer): The rainy season usually starts in May (sometimes in late April) and lasts until September/October. It's influenced by the summer monsoon. In October it's getting slightly better, and November is often more or less safe. Weather can change quickly in the wet season and without the slightest signs of warning. Darker, rainy and very windy periods can be very short, but heavy rain, storm and a rough sea for a couple of days in a row is possible. However, even with more cloudy days and more rainfall in the wet season, the sun shines on average for 7 hours each day. The wet season is the best time for surfing and really impressive sunsets.

    Sea Conditions for Diving/Snorkeling

    The best months for diving and snorkeling are in the dry season from December/January to April/May during the Northeast Monsoon: The sea is calm, and the visibility is good. During the wet season, you could experience a rough sea, rain and less visibility due to the plankton. However, some divers visit in the wet season because: a) It's less busy and there is also more underwater life going on. b) Rain can be heavy sometimes but is often brief. On some days the visibility is as good as in dry season. c) In certain areas (see above: Hanifaru Bay) the best time to spot whale sharks and manta rays is during the wet season. In the end, it's a matter of personal preference. Many would only go in the dry season, and others prefer the rainy season with lower rates and less traffic. There are some interesting reports and opinions in this TripAdvisor topic:  Maldives Diving - Low Season vs High Season


    Tourists/Seasons

    Peak Season (= dry season):
    Mid-December to March and in August (school holiday) the prices are at their highest.

    Shoulder Season:
    April except for Easter and the first half of December after the low season. In December the rates also start to climb.

    Low Season (= wet season):
    May until July and September until November with lower prices and attractive offers. Several resorts are closed from May to September.

    MV Maldives

    Tours are offered from October until May. Very best time for snorkeling around Surin islands from late January until the end of February due to a very calm sea at this time of the year. The sea can be rough, and sea sickness can be an issue. 

    Shoulder Season – less crowded:
    October, November and April, May except Easter
    October sometimes still too rainy and trips are canceled. May is hot but often still nice.

    Peak Season:
    December until March. Prices are at the highest level. Surin is not offered daily and should be booked a few days in advance.

    Similan Islands and Surin Islands are very popular for snorkeling. We got told that the reefs around Surin are more beautiful and Similan beaches are overcrowded. The trips are pricey therefore think twice where to go and when.

    TH Thailand

    The Islands are a year-round destination. Except for Santa Barbara Island, where boats run only from April to November to San Miguel, Santa Barbara, and Santa Rosa. Boat trips to Anacapa and Santa Cruz Island are possible year-round, depending on the weather. Boat trips are not offered daily. Booking in advance is essential. 


    Most visitors come in summer during the June through August period. However, due to the limited transportation opportunities, it doesn’t get crowded.

    Climate:
    The islands have a cool Mediterranean climate, but weather varies considerably from island to island. The winter is cool and wet summer is warm and often dry. Most rainfall from November to April with its peak in January and February and drier from May to October. Summer is the driest period. The climate is influenced a lot by the sea. Fog may appear, especially on the outer islands during the night but can occur at any time. The islands are often windy, and strong winds occur on the outer islands. Strong eastern winds from October to January. Sea temperature is around 50°F (10°C) in winter and around 65°F (18°C) at the end of summer.

    Activities:
    Each season has its own character and different weather, natural history events, and outdoor activities. The best time to visit one of the islands depends on what you are looking for as well as the activities you’re planning:

    Snorkeling: It's a snorkeling paradise and best at the end of summer until fall with a water temperature of about 65°F (18°C).

    Watersports: Besides snorkeling, summer until fall is also the best time for sailing diving, kayaking, and swimming. Many consider early fall as the best time of year for diving or snorkeling as ocean temperatures go up to 70° (F) and visibility may reach 100 feet.

    Whale Watching: January until March has the highest chance for gray whale sightings.
    April to September is the season for blue and humpback whales due to the high plankton concentration. Year-round spottings: orcas, minke whales and different species of dolphins. Besides, it is common to spot seals, sea lions and water birds.

    Birding: Birding is outstanding in the Channel Islands. Some endemic birds occur here like the Island Scrub Jay on Santa Cruz Island. Best time is the nesting season in spring. Shorebirds are best seen on Santa Cruz, Santa Rosa, and San Miguel.

    Surfing: In the winter and spring the north shore is best, and in the summer and fall it’s the south shore. Best access to all surf spots by private boat due to the remote locations. Besides being one of the best times for surfing, in the winter also some of the best sunsets occur.

    Wildflowers: Depending on the amount of rain from the end of winter until spring some continue to bloom during summer. Gumplant, buckwheat, poppies, and verbena can still be viewed in the summer.

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