Swimming at Playa de Martínez is generally not recommended due to variable water quality in the Río de la Plata. The river's brownish color comes from natural sediment, but urban runoff can also affect cleanliness. Water quality reports should be checked before entering, particularly after rainfall. Most visitors use this beach for relaxation, walking, and family outings rather than swimming. The area is considered safe from a security perspective during daytime, especially on weekends when families gather. Lifeguards are not typically present, so exercise caution if you decide to wade in the water.

Playa de Martínez is enjoyable year-round, though spring (September-November) and summer (December-February) offer the warmest weather for beach activities. Weekday visits provide a quieter experience compared to weekends when local families frequent the area. Late afternoons are particularly beautiful for sunset views over the Río de la Plata. The beach remains accessible in autumn and winter for scenic walks along the San Isidro coast. Since this is a family-friendly neighborhood beach, Saturday and Sunday mornings attract more visitors, while early weekday mornings offer peaceful solitude.