Swimming at Kongsmark Beach is generally safe during calm conditions, though the North Sea requires caution. The beach has gently sloping tidal flats, so water depth increases gradually—you may walk considerable distance before reaching swimming depth. Currents can strengthen during windy weather or changing tides. Water temperatures are cool, typically 15-18°C in summer. No lifeguard service operates here, so swimmers must assess conditions independently and supervise children carefully. Check weather and tide forecasts before entering the water. The shallow areas are excellent for paddling with young children.

Kongsmark Beach is best visited May through September for warmest weather and longest daylight hours, with July-August offering peak summer conditions. However, the shoulder seasons (May-June and September) provide pleasant temperatures, fewer visitors, and lower accommodation prices. These months are ideal for walking, cycling, and enjoying nature without crowds. Spring brings migrating birds to the dunes. Autumn offers dramatic skies and peaceful atmosphere. Winter visits suit hardy beachcombers seeking solitude, though facilities may be limited and weather can be stormy. Weekdays throughout the season are quieter than weekends.