Green Bay Beach is generally safe for swimming, though it's better suited for confident swimmers than young children due to its cove setting. The waters are clear and calm on most days, making it excellent for snorkeling. Rocky areas around the cove edges require caution when entering the water; water shoes are recommended. The bay's sheltered nature usually keeps conditions gentle, though always check for currents. Snorkelers should stay aware of boat traffic and avoid swimming too far from shore. The beach may not have lifeguards year-round, so exercise appropriate caution and swim within your abilities.

The best time for snorkeling at Green Bay Beach is from May through October when water temperatures are comfortable and visibility is excellent. Morning hours typically offer the calmest, clearest conditions with best underwater visibility. June and September provide ideal combinations of warm water, good weather, and fewer crowds compared to peak July-August. Water clarity is generally superb throughout summer. For those seeking solitude, visit on weekdays or during shoulder seasons when the beach is less crowded. Calm, sunny days provide optimal snorkeling conditions, allowing you to fully appreciate the marine life and underwater rock formations.