Kermia Beach, being a hidden cove, offers generally calm swimming conditions but lacks the organized facilities and lifeguards found at major beaches. The cove's sheltered nature typically provides protection from winds and waves, making it suitable for swimming. However, as a more secluded spot, swimmers should be self-reliant and assess conditions independently. Rocky areas may be present, so water shoes can be helpful. Check weather and sea conditions before visiting, avoid swimming alone, and be mindful that emergency services may take longer to reach this remote location.

The ideal time to visit Kermia Beach is during the shoulder months of May-June and September-October when weather is excellent and the cove remains peaceful. Peak summer months offer warmest waters but may bring more visitors seeking hidden spots. As a less-crowded destination, Kermia Beach maintains its tranquil character better than resort beaches even in high season. Morning visits often provide the most serene experience. The cove's sheltered position can make it enjoyable even when other beaches are windier, though winter months see cooler temperatures and rougher seas.