Papua New Guinea — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Papua New Guinea. 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
Papua New Guinea's coastline sits in warm equatorial seas, so coastal water temperatures stay comfortably warm year‑round. Typical sea surface temperatures range roughly from 25–31 °C (77–88 °F) depending on location and season. During the austral winter months (May to October) waters are generally a little cooler, commonly about 26–29 °C (79–84 °F), while the warmer austral summer and pre-monsoon months (November to April) often push sea temperatures toward 28–31 °C (82–88 °F). Local variations occur near river mouths, in sheltered bays, and where ocean currents or upwelling change conditions, and visibility can fall during the rainy season when runoff increases.
Swimming Conditions
Swimming and snorkeling are widely practiced and encouraged along many parts of the coast because the water is warm and reefs and marine life are readily accessible. Most resorts, diving operators, and local communities permit and promote swimming, diving, and snorkeling for tourism and subsistence use. However, swimmers should heed local guidance because hazards include strong currents or rips in exposed areas, sudden weather changes, limited lifeguard coverage in remote spots, and occasional dangerous marine animals. Residents and visitors are advised to check with local operators about tides, conditions, and safe entry points before swimming. With sensible precautions, the warm coastal waters of Papua New Guinea offer excellent opportunities for recreational swimming and underwater exploration.