Playa de Santa Justa is a compact cove, and while swimming is possible, its primary draw is its unique scenic beauty rather than extensive beach activities. The water is generally clear, but as an Atlantic cove, conditions can vary. Due to its smaller size and the presence of rocks, visitors should exercise caution, especially with children. There are typically no lifeguard services, so swimming is at your own risk. Always check local conditions before entering the water.

For the best weather, the summer months (July and August) are ideal, offering warmer temperatures and more sunshine. However, this is also when the beach will be most visited, despite its secluded nature. To experience its beauty with fewer people, consider visiting during the shoulder seasons of late spring (May-June) or early autumn (September-October). The weather can still be very pleasant, allowing for a more tranquil and photogenic visit to this unique cove.