Indonesia — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Indonesia. 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
Indonesia’s coastal waters are characteristically warm year-round, reflecting the archipelago’s tropical location. Sea surface temperatures typically range from about 24 to 31 °C (75 to 88 °F) depending on region and season. In most popular areas such as Bali, the Lesser Sunda Islands, and much of western and central Indonesia, water usually sits between 26 and 30 °C (79 to 86 °F). Some southern and eastern zones experience seasonal upwelling that can lower temperatures to around 24–26 °C (75–79 °F), while shallow lagoons and sheltered bays may warm toward the upper end of the scale. Seasonal variation is modest: during the dry season (roughly April–October) waters may be marginally clearer and slightly cooler in upwelling regions, and during the wet season (roughly November–March) coastal temperatures often rise by a degree or two, with localized differences driven more by currents and wind than by air temperature.
Swimming Conditions
Swimming is widely permitted and popular along Indonesia’s coasts; the generally warm sea means wetsuits are rarely necessary for casual swimmers and snorkelers. However, conditions can become hazardous during strong monsoon winds and heavy surf, when beaches may be closed or subject to dangerous rip currents. Coral reefs and rocky seabeds require caution to avoid injury, and local advisories should be heeded for jellyfish, water quality, and boat traffic. For diving and snorkeling, the warm temperatures support rich marine life and long comfortable sessions in the water, though divers in cooler upwelling areas sometimes use light thermal protection for extended dives.