Swimming at Plyazh Kostochka in the Volga Delta is generally safe during the summer season, though conditions differ from coastal sea beaches. The water here is river delta water, typically calmer than open sea but with its own characteristics. Current strength can vary depending on Volga flow and season. Water quality is generally suitable for swimming during peak season, though it may not be as clear as sea water. The beach is family-oriented, suggesting manageable conditions for most swimmers. Still, supervise children carefully and be aware that delta waters have different dynamics than ocean beaches.

The best time to visit Plyazh Kostochka is during the warm weather months from June through August, when the Astrakhan region experiences its hottest temperatures, ideal for swimming and sunbathing. July and early August typically offer the most reliable beach weather with warm water temperatures. The Volga Delta can be extremely hot in midsummer, perfect for cooling off in the water. Spring and early autumn may be pleasant for visits but less suitable for swimming. Avoid the colder months when the delta region experiences harsh continental winter conditions unsuitable for beach activities.