The National Sea Rescue Institute (NSRI) urges beachgoers to exercise caution during this new moon spring tide, which peaks tomorrow, Saturday 20 December 2025, as it will significantly affect tidal conditions over this weekend. This natural phenomenon occurs when the sun, moon, and Earth align during the new moon phase, amplifying the gravitational pull on the Earth’s oceans.
The effects of this new moon spring tide will be felt over this weekend and for the next few days, and the NSRI is asking beach visitors, rock and surf anglers, and people who intend to walk on coastal paths to be aware of the stronger tidal variation typical of spring tides.
What to expect during a spring tide
Higher high tides: water levels will rise significantly, reaching further up the shoreline.
Lower low tides: more of the seabed will be exposed as water levels dip below average.
Increased tidal range: the difference between high and low tide levels will be at its maximum.
Dangers of a full moon spring tide
Spring tides often result in stronger tidal currents, particularly in narrow inlets. This natural phenomenon can be dangerous:
Swimming: stronger tidal flows make rip currents stronger, which is dangerous for swimmers.
Coastal hiking: some hiking trails near the coast may become inaccessible or dangerous during high tide.
Fishing: shoreline anglers should be extra careful because bigger waves can come closer to shore, even where it’s usually safe to stand.
How to stay safe
Beach and swimming
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Swim at lifeguard-protected beaches and to avoid rip currents, swim between the lifeguard flags.
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Learn how to recognise rip currents and avoid them. They are particularly strong during spring tides, especially during outgoing tides.
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Stay informed: check daily weather forecasts from the South African Weather Service (SAWS) and consult tide timetables.
Coastal activities
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Hiking: plan your hike carefully, avoiding trails that may be cut off during high tide.
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Fishing: shoreline anglers should maintain a safe distance from the water. When fishing from rocks or cliffs, you should wear a life jacket and carry flotation equipment (for example, a 5L water container with a rope attached) that can be thrown to someone in the water.
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Boating and paddling: always wear a life jacket, carry essential safety equipment and keep your cellphone fully charged in a waterproof pouch. The free NSRI SafeTrx smartphone app allows you to log your trip and call the NSRI for help quickly and easily.
General water safety
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Alcohol and swimming: drinking alcohol before an activity in or near water may put your life at risk.
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Supervise children: ensure they are under the supervision of a responsible adult in and near the water.
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Inland water: Be cautious around rivers, lakes, and dams, especially during heavy rainfall.
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Watch the weather: Monitor adverse weather conditions such as strong winds and fast-flowing rivers.
Additional precautions
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Time your activities: be cautious during tide changes. Beachgoers are at risk when high tide recedes to low tide; rock anglers are at risk from the incoming tide.
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Stay informed: follow local safety alerts and warnings issued by authorities.
