Quicklink to Durban tides…
And Cape Town…
This is a variable as important as neaps vs springs, high vs low. It is the coefficient and represents the amount of overall tide at a given time. You see, it is quite possible, that a spring high tide in November, is well higher than a spring tide in March. Sometimes, in some places, this difference can be up to or more than a metre (it is not so radical further south).
So this forecast is vital to be taken into account in all bar crossings or navigation through shallow areas. Luckily it is well documented and is certainly something you need to know about.
You can study up on tidal coefficients and see the actual levels on the Tides for Fishing website at this link.