Swimming at Aci Trezza is generally safe but requires caution due to the rocky, volcanic coastline. There are no sandy entry points; access to the water is via rocks or small platforms, making it less suitable for young children or inexperienced swimmers. The seabed is rocky with sea urchins in places, so water shoes are highly recommended. Currents are typically mild, and the protected position offers calm waters. However, there are no lifeguards or organized beach services. The area is better suited for confident swimmers and snorkelers who can navigate rocky terrain comfortably.

The best weather for visiting Aci Trezza is from May through September, with June and September offering ideal conditions without peak summer crowds. July and August bring warmest waters but also the most tourists drawn to the famous Faraglioni rock formations. For photography and sightseeing, late afternoon provides beautiful golden-hour light on the volcanic rocks. Spring (April–May) and autumn (October) offer pleasant weather for exploring the village and coastline, though swimming may be chilly. Weekdays are quieter than weekends year-round. The area remains accessible and picturesque even outside swimming season.