Marshall Islands — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Marshall Islands. Learn about today’s conditions, monthly averages, and how the surrounding seas and oceans vary by season. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
Coastal Seas and Oceans
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
The Marshall Islands sit near the equator, so sea temperatures remain warm throughout the year. Typical coastal waters average roughly 27–29 °C (81–84 °F) for much of the year, with a modest seasonal swing from about 26 °C (79 °F) in the coolest months up to around 31 °C (88 °F) in the warmest months. Variations are small compared with temperate regions, and surface temperatures in lagoons tend to be slightly higher and more stable than those on the ocean-exposed sides of the atolls. Warm water and good year-round visibility in many areas make snorkeling and swimming comfortable most months, though rainfall and runoff during the wetter season can reduce clarity at times.
Swimming Conditions
Swimming is generally allowed and widely practiced on the atolls, particularly in protected lagoons where shallow, sheltered waters and coral reefs create safe, enjoyable conditions for swimmers and snorkelers. The open ocean side can have strong currents, surf and occasional rough weather, so local advice should be heeded and swimming avoided in exposed passes or during storms. Lifeguards are not common across the islands, so swimmers should be cautious, stay close to shore, and be aware of coral, sea urchins and marine life. Overall, the consistently warm sea temperatures make the Marshall Islands attractive for year-round water activities, with safety best ensured by using lagoon areas, checking local conditions, and respecting tides and reef channels.