Yes. While it isn't ever 100% safe at the beach, you would have less chance of incident when a lifeguard is on duty. Common sense of course, but when there is a lifeguard (or at least other people around), you will have someone there to help you if you need it. When there is no lifeguard on duty, then usually the undertow warning flags will not be put out, and if you swim in an area with strong undertow, then you are risking your life, since a sudden undertow can drag hundreds of feet from the shoreline in a few seconds and drown you. Swimming between the hours of Dusk and Dawn, approximately 6pm and 6am, varying of course by season, is very dangerous. It is during these darker hours that sharks come very close to the beach and feed. Many shark attacks occur at night when night swimmers carelessly stray far from the shore. The 'Jaws' scenario in this case is actually more fact than fiction. As always, pending weather conditions and daylight ours vary by season. If ther eis no lifeguard on duty, or if it is getting dark, then it is not a good idea to go into the water. Of course, plenty of private beaches don't even have lifeguards, so swim there at your own risk.

night

Night is much more dangerous.

YES! Sunrise and sunset...and when it is calm and overcast...Studies have revealed that this is when most shark attacks happen. The coastline in the area of Perth, Western Australia, and further south, has a reputation for attacks by white pointers... The area is not netted and the authorities have a protection order on these " great whites"