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Maine diving. Backdrop for the Diving Hubs Maine dive shop directory

Scuba Diving · Maine

Scuba Diving in Maine

Dive 21 dive shops and charters across Maine. Maps, hours, contact info, photos, and verified operator profiles, all in one place.

Rocky coast, the North Woods, and Acadia.

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About Maine

Maine offers a distinctive cold-water diving experience along its rugged coastline, characterized by granite ledges, vibrant kelp forests, and numerous historical shipwrecks. The Gulf of Maine's nutrient-rich waters support a diverse ecosystem, making it a captivating destination for divers seeking unique marine encounters. Dive shops, primarily located in coastal towns like Portland, Boothbay Harbor, and Bar Harbor, serve as essential hubs, providing charter services to offshore sites and offering specialized cold-water gear rentals and training.

Exploring Maine's underwater realm often involves boat diving, as many of the most rewarding sites are accessible only by vessel. From the relatively sheltered waters of Casco Bay to the more exposed ledges off Mount Desert Island, divers can expect encounters with lobsters, crabs, various groundfish, and sometimes seals. Visibility typically ranges from 10 to 40 feet, influenced by plankton blooms and tidal currents, while water temperatures remain cool, necessitating appropriate exposure protection.

The state's maritime history is etched beneath its waves, with countless wrecks ranging from wooden schooners to modern steel vessels. These artificial reefs attract a variety of marine life and offer intriguing exploration opportunities for certified wreck divers. While not a tropical destination, Maine provides a challenging yet immensely rewarding environment for divers prepared for its unique conditions, offering a truly wild and unspoiled underwater frontier.

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Quick facts

Dive shops and charters listed
21
Best season
June through October

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21 dive shops and charters

across Maine

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Water Bodies and Seasons

Diving in Maine occurs primarily in the Atlantic Ocean and its numerous bays, with the prime season running from late May through early October. Some protected inland lakes offer limited freshwater diving.

Exposure Protection

Water temperatures in the Gulf of Maine typically range from 40–55°F (4–13°C) during the dive season, often dropping below 50°F at depth. A drysuit is highly recommended for comfort and safety; a thick 7mm wetsuit with hood, gloves, and boots is the minimum.

Visibility and Conditions

Visibility varies significantly based on location, tides, and plankton, commonly ranging from 10–40 feet. Strong currents are present in some areas, particularly around islands and ledges.

Certification Levels

While Open Water certification is a prerequisite, Advanced Open Water Diver or higher is often recommended for many of Maine's signature sites, especially those involving deeper wrecks or significant currents. Drysuit certification is also highly beneficial.

Access and Sites

Most premier dive sites, including popular wrecks like the SS Portland (though deep and far offshore) and vibrant rocky reefs, are boat-accessed. Shore diving opportunities are limited and often involve challenging entries over slippery rocks.

Marine Life and Regulations

Divers will encounter lobsters, crabs, various fish, and harbor seals. Observe all marine life from a respectful distance. Harvesting marine resources generally requires specific state licenses and adherence to size and bag limits; verify with the Maine Department of Marine Resources.

Confirm current requirements with the state agency before your trip. Rules and fees change every season.

  • Harvester License for Marine Resources

    Divers wishing to harvest marine organisms, such as lobsters or scallops, must possess the appropriate state-issued harvester license from the Maine Department of Marine Resources. Regulations vary by species and season.

  • Boating Safety Education

    Any person born on or after January 1, 1999, operating a motorboat over 25 horsepower in Maine waters must complete an approved boating safety course. This applies to private boat operators accessing dive sites.

  • Marine Mammal Interaction Guidelines

    Federal law prohibits harassment of marine mammals. Divers should maintain a safe and respectful distance from seals, whales, and other marine mammals, avoiding any actions that could alter their natural behavior.

    NOAA Fisheries
  1. 01

    Assess Your Cold-Water Readiness

    Ensure you possess the necessary cold-water diving experience and equipment, such as a drysuit or thick wetsuit, hood, and gloves. Consider obtaining a drysuit specialty certification.

  2. 02

    Research and Contact Dive Shops

    Identify reputable dive shops and charter operators in your target region of Maine. Inquire about their dive schedules, equipment rentals, and specific site offerings.

  3. 03

    Verify Certification and Experience Requirements

    Discuss your certification level and diving experience with operators. Some advanced sites or challenging conditions may require specific training or a higher level of experience.

  4. 04

    Monitor Weather and Sea Conditions

    Maine's coastal weather can be unpredictable. Closely monitor marine forecasts and be prepared for potential changes or cancellations, especially when planning boat dives.

  5. 05

    Plan Accommodations and Logistics

    Book lodging in advance, particularly during peak summer months. Account for travel time to dive shop meeting points and boat launches, as many prime sites are boat-accessed.

01What is the typical water temperature in Maine?
Water temperatures in Maine's coastal waters generally range from 40–50°F (4–10°C) during the main diving season from late spring to early fall. Surface temperatures can sometimes reach the low 60s°F (15°C) in sheltered bays during August.
02What kind of exposure protection is necessary for diving in Maine?
Due to the cold water, a drysuit is strongly recommended for comfort and extended bottom times. If using a wetsuit, a 7mm suit with a hood, gloves, and boots is considered the minimum protection needed to dive safely in Maine.
03What marine life can divers expect to see?
Maine's cold, nutrient-rich waters host a variety of marine life. Divers frequently encounter lobsters, crabs, various species of fish like cod and pollock, sea stars, anemones, and seals. With luck, a diver might spot a wolfish or even a small shark.
04Are there many shipwrecks to dive in Maine?
Yes, Maine has a rich maritime history, and its waters contain numerous shipwrecks. These range from wooden schooners to steel freighters, offering diverse wreck diving experiences. Many are boat-accessed and require appropriate training and experience.
05Is shore diving a common option in Maine?
Shore diving opportunities in Maine are limited compared to boat diving. The coastline is often rocky and rugged, making entries and exits challenging. Most of the most rewarding and accessible dive sites are reached by charter boat.
06What certification level is recommended for diving in Maine?
While an Open Water certification is the starting point, an Advanced Open Water certification is often recommended due to the typical diving conditions, which can include deeper sites, currents, and cooler temperatures. Drysuit certification is also highly beneficial.

When to go

Season by season in Maine

Spring (April-June)

Water temperatures remain cold, but visibility often improves as ice melts and plankton blooms are less intense. Dive shops begin offering charters, gearing up for the busier summer season.

Summer (July-August)

This is peak diving season. Water temperatures are at their warmest, ranging from 50–60°F near the surface, and visibility is typically at its best. All dive shops and charter operations are fully active.

Fall (September-November)

Water temperatures gradually cool, but visibility can be excellent due to reduced plankton. Fewer divers are present, offering a more serene experience, though sea conditions can become choppier.

Winter (December-March)

Diving is challenging due to very cold water and potential ice. It is limited to experienced drysuit divers and specialized operations, with many dive shops closing or offering reduced services.

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