Ai Manis Beach generally offers calm, shallow waters suitable for swimming and snorkeling, particularly during the dry season when conditions are most favorable. The beach's protected location helps maintain gentle waves, making it appropriate for families and beginner snorkelers. However, always assess current conditions before entering the water, as currents can vary. There are limited lifeguard services at this remote beach, so exercise caution and swim within your abilities. The coral reefs close to shore provide excellent snorkeling opportunities in clear visibility, though be mindful to avoid touching or stepping on coral to preserve the marine ecosystem.

Ai Manis Beach is accessible year-round, but the optimal visiting period is during Indonesia's dry season from April to October, when you'll encounter sunny skies, calmer seas, and excellent underwater visibility for snorkeling. The wet season (November to March) brings occasional heavy rainfall and rougher ocean conditions, though the beach remains beautiful and less crowded during these months. Water temperatures stay warm throughout the year. Since this is a relatively undiscovered destination, you can enjoy a peaceful experience even during peak tourist months when other West Nusa Tenggara beaches become crowded.