Crantock Beach is generally safe for swimming, particularly within the designated lifeguard patrolled areas during peak season. However, as it's at the mouth of the Gannel estuary, currents can be strong, especially on outgoing tides. Always pay attention to lifeguard flags and local warnings. The water quality is regularly monitored, and the sandy bottom makes for pleasant wading.

For the best weather, the summer months (June to August) are ideal, but this is also when the beach is busiest. To enjoy pleasant weather with fewer crowds, consider visiting during the shoulder seasons of late spring (May) or early autumn (September). Weekdays outside of school holidays will generally offer a more tranquil experience, allowing you to appreciate the scenery.