French Guiana — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of French Guiana. 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
French Guiana's coastline faces the warm waters of the western tropical Atlantic, and sea temperatures there remain inviting year-round. Surface temperatures typically vary from about 26–27 °C (79–81 °F) in the cooler months to roughly 28–30 °C (82–86 °F) during the warmer part of the year. Seasonal change in temperature is small compared with temperate zones, but local conditions shift with the rainfall and river discharge: the months with heavier rains and stronger river outflow can produce cooler, more turbid coastal water near estuaries, while drier periods usually bring clearer, slightly warmer seawater.
Swimming Conditions
Swimming is generally allowed and popular at designated beaches, but conditions and safety vary along the coast. Many coastal stretches are remote and not lifeguarded, and river mouths and estuarine zones can have strong currents, sudden drop-offs and reduced water quality from runoff, so swimming is safest at monitored beaches and during calm weather. Marine life such as jellyfish can appear seasonally, and nesting turtles are protected on some beaches, which may lead to restricted access during breeding seasons. Visitors should heed local signage and guidance from authorities or resort staff, avoid swimming near river mouths or rough surf, and be aware that water clarity and buoyancy may change with tides and sediment from inland rivers. Overall the warm sea temperatures make swimming thermally comfortable year-round, provided local safety considerations are followed.