Caswell Bay is generally considered safe for swimming and is popular with families, indicating relatively calm conditions. However, it's also known for surfing, so there can be waves, especially on certain days. Lifeguard services are often provided during peak seasons, which adds to its safety. Always check local flags and signage, and be aware of the tides and any currents. The sandy bottom makes for a pleasant entry into the clear waters.

For optimal weather, the summer months (June to August) are ideal, offering the warmest temperatures and most sunshine for sunbathing and swimming. However, these are also the busiest times. If you prefer fewer crowds while still enjoying good weather, consider visiting in late spring (May) or early autumn (September). These shoulder seasons often provide pleasant conditions without the peak summer rush, making for a more relaxed visit.