The sea off the coast of Mar del Plata reached a temperature record this Friday, December 5th, with 18.5 degrees.
This mark equals the highest level for this date in the last 10 years.
Consistently, in the last few days the water temperature has been rising on the Buenos Aires coast.
The current value is above the usual average for December, which is 18 degrees Celsius.
Despite environmental concerns, the record reached promises a start to the season with more pleasant waters for tourists.

Mar del Plata: a record December for sea temperature
The sea temperature at the start of this month in Mar del Plata is not only high but matches the maximum peak recorded in the last decade.
This positions December as one of the warmest on the Argentine coast.
The historical record of sea temperature in Mar del Plata confirms the trend of recent summers.
In recent years, it is increasingly approaching temperate temperatures on the maritime coast.
In detail, historical data reveals the significant contrast between years:
- Current temperature: 18.5 degrees Celsius (Friday 5/12)
- Historical record: 18.5 degrees (matched in previous years)
- Coldest value: 15.6 degrees Celsius (recorded in 2018)
- December average: 18 degrees Celsius
The historical range for this month ranges from a minimum of 15.3 degrees to a maximum of 21.3 degrees Celsius.
What is the forecast for the coming days in Mar del Plata
Despite the milestone reached, a moderate decrease is expected in the coming week.
Projections indicate that the sea water temperature in Mar del Plata would slightly drop to 17.9 degrees Celsius in the next 10 days.
However, the thermal level will remain comfortably above the historical average for the beginning of the month.
Thus, this thermal stability is favorable for the development of the season and seems like good news for the tourism sector.

Summer will arrive with the water “just right”
For tourists, the news is encouraging. The current record of 18.5 degrees sets a warm base for the official arrival of summer.
Historically, the season in Mar del Plata is concentrated from January to March.
In general, during those months the water temperature does not drop below 20 degrees, being considered suitable for swimming.
Observing the annual average temperature of the water reflects the city’s seasonal contrast:
- Summer: 19.8 degrees Celsius
- Autumn: 18.2 degrees
- Spring: 13 degrees
- Winter: 11.5 degrees
These values show how the ocean experiences significant variations throughout the year on the Buenos Aires coast.
With a December starting with a record mark, expectations for a summer with maritime temperatures above the average of 19.8 degrees are high.
This promises a warmer and more enjoyable season for those visiting the Mar del Plata beaches in the coming months.
The sea temperature record confirms a sustained trend towards warmer conditions.



