The National Sea Rescue Institute (NSRI) has issued a coastal safety advisory, urging beachgoers and ocean users to be extra vigilant as a full moon spring tide affects coastal conditions this weekend, peaking on Monday, 5 January 2026.

Spring tides occur when the sun, moon and Earth align during a full moon, amplifying the gravitational pull on the oceans. This results in more extreme tidal conditions, with higher-than-usual high tides and lower low tides. According to the NSRI, the effects will be felt over the weekend and for several days thereafter.

The institute is warning beach visitors, swimmers, rock and surf anglers, hikers and boaters to be aware of stronger tidal variations and increased hazards along the coastline.

During a spring tide, water levels can rise significantly, reaching further up the shoreline, while low tides expose more of the seabed than usual. The tidal range – the difference between high and low tide – is also at its maximum.

These conditions often result in stronger tidal currents, particularly in narrow inlets and estuaries. The NSRI says this increases the risk of rip currents at beaches, as well as powerful tidal flows in areas such as the Knysna Heads. Coastal hiking trails may become hazardous or inaccessible during high tide in the afternoon, while anglers face the danger of waves reaching beyond normally safe zones.

To reduce the risk of accidents, the NSRI is advising swimmers to only enter the water at lifeguard-protected beaches and to swim between the flags. Beachgoers are urged to remain alert for rip currents, which are typically stronger during outgoing tides in the late afternoon and early evening.

Shoreline anglers are advised to keep a safe distance from the water, and those fishing from rocks or cliffs should wear life jackets and carry flotation equipment that can be thrown to someone in distress. Boaters and paddlers are reminded to always wear life jackets, carry essential safety gear and keep their cellphones fully charged in waterproof pouches. The NSRI’s SafeTRX smartphone app can also be used to log trips and quickly request help in an emergency.

The institute has also warned against consuming alcohol before swimming or taking part in water-based activities, and stressed the importance of close supervision of children near water. Inland water users are cautioned to be careful around rivers, lakes and dams, particularly after heavy rainfall, and to remain alert to adverse weather conditions such as strong winds and fast-flowing rivers.

Beach visitors and anglers are encouraged to carefully plan activities around tide changes, especially during late afternoon high tides, and to stay informed by checking weather forecasts and tide tables.

“The effects of spring tides can last several days,” the NSRI said, adding that by following safety guidelines, the public can minimise risks and enjoy coastal activities responsibly.