Argentina — Sea Water Temperature and Annual Ranges

Sea Water Temperature Along the Coast

Places with the Warmest Sea Water Today

The Most Popular Seaside Places

Coastal Seas and Oceans

Water Temperature and Swimming Overview

Water Temperature Trends

Argentina’s long Atlantic coastline offers a wide range of sea temperatures that vary sharply with latitude and season. Along the temperate Buenos Aires region and popular resort towns like Mar del Plata, summer (December–February) water typically warms to about 18–24 °C (64–75 °F), making bathing comfortable for many visitors. Spring and autumn commonly see sea temperatures around 12–18 °C (54–64 °F), while winter can cool waters to roughly 8–12 °C (46–54 °F). Traveling south into Patagonia, the ocean is markedly colder because of the Malvinas (Falklands) current: summer temperatures often reach only about 10–16 °C (50–61 °F), with shoulder seasons around 6–12 °C (43–54 °F) and winter lows commonly between 4–8 °C (39–46 °F). At the southern tip near Ushuaia and Tierra del Fuego, sea temperatures remain very cold year-round, frequently in the range of 2–8 °C (36–46 °F).

Swimming Conditions

Swimming is generally allowed along Argentina’s coast, but whether it is pleasant or advisable depends on location and season. The warmer central beaches attract large numbers of swimmers during the austral summer and are typically monitored by lifeguards, whereas Patagonian and Tierra del Fuego waters are cold enough that most people wear wetsuits or limit time in the water; cold-water shock, strong winds and currents make conditions potentially hazardous. Local authorities post advisories for water quality, surf and weather, so visitors should follow flags, heed lifeguards and choose sites and seasons that match their experience and tolerance for cold.