
Located on the south coast of Alaska, Prince William Sound is a picturesque sound off the Gulf of Alaska. It is known for its glaciers, waterfalls, and diverse wildlife. The region experiences variable weather, with dense morning fog that usually clears by midday, and strong localized winds that pick up in the latter half of the day. The water temperature in Prince William Sound typically ranges from 38.1°F to 43.9°F in January, with the average being 41°F. Throughout the year, the water temperature does not exceed 68°F, making it unsuitable for comfortable swimming.
| Characteristics | Values |
|---|---|
| Location | Gulf of Alaska, South Coast of Alaska, USA |
| Area | 10,000 square miles |
| Towns | Cordova, Valdez, Whittier, Chenega, Tatitlek |
| Waterways | Protected waterways, fjords |
| Islands | Montague Island, Hinchinbrook Island, Hawkins Island |
| Glaciers | Around 150 |
| Wildlife | Humpback whales, orca whales, porpoises, sea otters, sea lions, seals, black bears, brown bears, mountain goats, moose, Dall sheep, over 220 species of birds |
| Temperature | Today: 41.9°F; January average: 41°F; Summer average: 55.4°F; Spring average: 41.9°F; Autumn average: 49.3°F; Maximum: 68°F |
| Oil spills | Second-largest in US waters after the 2010 Deepwater Horizon oil spill |
| Tsunami risk | A mile-long slope on the Barry Arm fjord could trigger a catastrophic tsunami within the next two decades |
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What You'll Learn

The water temperature in Prince William Sound rarely exceeds 68°F
Prince William Sound is a sound off the Gulf of Alaska on the south coast of the US state of Alaska. It is located on the east side of the Kenai Peninsula, encompassing 10,000 square miles of protected waterways, islands, fjords, and around 150 glaciers. The region is home to diverse marine life, including humpback whales, orca whales, porpoises, sea otters, sea lions, and seals. The rugged coastline and dense temperate rainforests are also home to various land animals, including black bears, brown bears, mountain goats, moose, and Dall sheep.
Due to its location in the Gulf of Alaska, the water temperature in Prince William Sound rarely exceeds 68°F. In fact, the average water temperature in the winter reaches 41.2°F, in spring 41.9°F, in summer 55.4°F, and in autumn 49.3°F. The coldest month for water temperature is typically January, with an average of 41°F, a minimum of 38.1°F, and a maximum of 43.9°F.
The unique characteristics of Prince William Sound, including its glaciers and wildlife, make it a popular destination for tourists. However, due to its remote location, the only way to access the sound is by boat or plane. Kayaking is a popular activity in Prince William Sound, and it is important to be aware of the rapidly changing weather conditions, including dense morning fog and strong winds.
Overall, the water temperature in Prince William Sound remains relatively cold throughout the year, with a maximum temperature of 68°F, making it unsuitable for comfortable swimming.
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Fog and wind conditions can change quickly
Prince William Sound is a sound off the Gulf of Alaska on the south coast of the US state of Alaska. It is located on the east side of the Kenai Peninsula, encompassing 10,000 square miles of protected waterways, islands, fjords, and around 150 glaciers. The region is known for its diverse wildlife, including humpback whales, orca whales, porpoises, sea otters, sea lions, and seals. The rugged coastline and dense temperate rainforests are home to black bears, brown bears, mountain goats, moose, and Dall sheep. Fog and wind conditions can change quickly in Prince William Sound, and it is important to be prepared for these changes, especially when participating in activities such as kayaking or paddling.
One common scenario in Prince William Sound is to wake up to dense morning fog that typically burns off by midday. While kayaking, it is important to stay near the coast and always have a compass easily accessible. If you are paddling offshore and encounter fog, use your compass to take a bearing on the nearest shoreline and head in that direction. Keep in mind that metal items like stoves or saws can interfere with your compass bearing, so be aware of their placement.
The wind in Prince William Sound can also pick up quickly, going from calm to strong gusts in a matter of minutes. Localized winds in the area usually come from the east, starting in the morning and strengthening throughout the day. If you notice whitecaps on the water, it is best to refrain from venturing out and stay on the beach. If whitecaps start forming while you are already paddling, head towards the shore. Local advice suggests making decisions based on current conditions rather than predictions or expectations.
The unique geographical features of Prince William Sound, including its islands, fjords, and glaciers, contribute to the varying and unpredictable weather conditions. The sound is surrounded by the Chugach Mountains, and its coastline is convoluted, with many inlets and bays. The towns of Cordova, Valdez, and Whittier serve as gateways to Prince William Sound and offer various tours and activities for visitors.
When planning a trip to Prince William Sound, it is essential to be aware of the ever-changing weather conditions and prepare accordingly. Fog and wind can quickly turn from calm to challenging, and understanding how to navigate through these conditions is crucial for a safe and enjoyable experience in this beautiful yet unpredictable environment.
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The largest port is Valdez
Prince William Sound is a sound off the Gulf of Alaska on the south coast of the U.S. state of Alaska. It is located on the east side of the Kenai Peninsula. The largest port in Prince William Sound is Valdez, at the southern terminus of the Trans-Alaska Pipeline System.
Port Valdez is a moderately large fjord located in north-central Prince William Sound, Alaska. It gained considerable importance in 1977 as the marine terminal for the Trans-Alaska Pipeline. In 1989, the Exxon Valdez oil spill occurred, which was the second-largest in US waters in terms of volume released. The oil, originally extracted at the Prudhoe Bay Oil Field, impacted 1,300 miles (2,100 km) of coastline.
Following the Exxon Valdez disaster, prevention of another oil spill has been markedly improved by the addition of dual escort vessels and the requirement that tankers be double-hulled. However, there will always remain some danger of a future spill, particularly at the loading facility and terminal located in Port Valdez. For this reason, the Prince William Sound Science Center (PWSSC) conducted a study of circulation within the Port to describe and quantify the currents within the fjord. The study was conducted during three seasons, including early summer (June) and fall (September) of 2016 and late winter (March) of 2017.
The currents were measured by tracking drifter buoys with drogues set to four different depths: surface, 1m, 10m, and 40m. In September, the ADCP currents increased to speeds of 25 to 35cm s-1 (~0.5 to 0.7kts) and extended to 25 to 30m in depth. In March, the water column had nearly uniform physical properties due to vertical mixing from winds and the sinking of dense, salty surface water.
Valdez is also a popular starting point for cruises and boat tours of Prince William Sound. Visitors can drive to Valdez and then charter a boat or plane to tour the Sound.
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The area is home to diverse wildlife
Prince William Sound is a vibrant ecosystem that supports a diverse range of wildlife, from microscopic plankton to majestic whales. The area boasts over 220 species of birds, including puffins, kittiwakes, murres, marbled murrelets, black-legged kittiwakes, glaucous-winged gulls, and bald eagles. The sound is also home to around 30 species of land mammals and at least 12 marine mammal species.
Brown and black bears roam the lowlands of the eastern islands, such as Hinchinbrook, Montague, and Hawkins, and are often seen fishing during salmon spawning season. Moose and mountain goats are also native to these areas. The western beaches of Prince William Sound are sometimes visited by black bears, which can be spotted against the backdrop of mountainous, glacier-studded vistas.
The sound is a haven for marine mammals, including humpback, sei, fin, minke, and killer whales. Steller sea lions, harbor seals, and sea otters are also abundant in these waters. The glaciers and waterfalls of Prince William Sound provide a stunning backdrop for wildlife viewing, with calving glaciers and icebergs adding to the dramatic landscape.
The nutrient-rich waters of Prince William Sound support a thriving ecosystem, attracting commercial and recreational fishermen alike. Iconic salmon species, such as sockeye, coho, and chinook, migrate through these waters, while the region's commitment to sustainable fishing practices ensures the continuation of this vital industry. The area is also home to indigenous communities with a deep connection to the land and sea, including the Eyak, Chugach, and Ahtna peoples, who have thrived in this harsh environment for centuries.
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There are various cruise options to see the Sound
Prince William Sound is a unique destination in Alaska, known for its glaciers, wildlife, and history. There are no roads in the area, so the best way to experience the Sound is by boat. There are various cruise options to see the Sound, each offering a different experience.
Phillips Cruises & Tours offers two types of cruises: the Glacier Quest Cruise and the 26 Glacier Cruise. The former takes passengers through the scenic waters of the Sound and into the Blackstone Bay fjord, where you can witness calving or rolling icebergs and learn about the glaciers and wildlife from a Forest Service Ranger. The latter is the fastest, most luxurious catamaran in Alaska, seeing the most glaciers and offering a no-seasickness guarantee. This cruise takes passengers to College Fjord, where they can see a dozen glaciers up close.
Lazy Otter Charters offers a 4-5 hour journey up Blackstone Bay, where passengers can see sheer cliff walls and tumbling waterfalls en route to two tidewater glaciers: Beloit and Blackstone. They also offer a Best of Prince William Sound Tour, where passengers can venture deeper into the Sound, explore Harriman Fjords, and see Surprise Glacier, which has the best calving in the area.
UnCruise Adventures' Prince William Sound Explorer with Cordova is perfect for those seeking to explore Alaska's backcountry. This adventure includes ice kayaking, hiking, kayaking around deserted islands, and witnessing towering icebergs and glaciers up close. Passengers can also hike up to the face of one of the only advancing glaciers in Alaska, the Columbia Glacier, and learn about how glaciers alter the landscape.
In addition to these options, there are other cruise companies that offer tours of Prince William Sound, such as Major Marine Tours, which offers a Surprise Glacier tour for $149 per adult.
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Frequently asked questions
The average water temperature in Prince William Sound in winter is 41.2°F.
The coldest water temperature ever recorded in Prince William Sound was 39.6°F in 2012.
The water temperature in Prince William Sound today is 41.9°F.
The temperature of the air in Prince William Sound varies, but it is not suitable for comfortable swimming as the temperature does not rise above 68°F.
The average water temperature in Prince William Sound in the summer is 55.4°F.










































