Spring tide explained: What beachgoers, anglers and hikers need to know

Heading to the coast this Heritage Day weekend? A strong spring tide is expected from Saturday to Tuesday. Here’s what beachgoers, anglers and coastal hikers need to know to stay safe.

The National Sea Rescue Institute (NSRI) is urging beachgoers, anglers and coastal hikers to take extra care this weekend as a full moon spring tide coincides with the school holidays and Heritage Day long weekend.

The full moon occurs on Saturday, September 26, at 18h48. The biggest tidal ranges usually occur a day or two after the full moon, meaning the strongest spring tides are expected from about Saturday, September 26, to Tuesday, September 29.

The spring tide also follows closely after the September 23 equinox, when spring tides tend to be among the strongest of the year.

An equinox is one of two moments each year when the sun sits directly above the equator. On an equinox, day and night are roughly equal in length everywhere on Earth.

Spring tides happen when the sun, moon and Earth align, strengthening the pull on the ocean.

According to NSRI Communications Manager Andrew Ingram, families heading to the coast should plan around the tides.

“Check the tide times where you are, swim at lifeguard-protected beaches, and if you are fishing from rocks, wear a life jacket and be sure to have flotation with you,” he said.

A bigger tidal range: The difference between high and low tide is at its greatest.

Rip currents: Stronger tidal flows make rip currents stronger, putting swimmers at risk.

Strong tidal currents: Flows through estuary mouths, harbour entrances and narrow inlets, such as the Knysna Heads, are much stronger than normal.

Coastal paths and hiking trails: Some routes may be cut off or become dangerous at high tide.

Rock and shoreline fishing: At high tide, waves can reach beyond areas that are usually safe.

Swim only at lifeguard-protected beaches and between the lifeguards’ flags.