I believe the best time to swim is either at high tide or low tide as the amount of change in water volume is the least.
There is a formula called the rule of 12ths which assuming the difference between high tide and low tide is 12m, says that during the first hour (from either high or low tide) the water raises by 1m, second hour it raises by 2m, third hour it raises by 3m, 4th hour it raises by 3m, fifth hour by 2m, 6th hour by 1m.
So given that this raise in water level represents a increase in movement its at its least movement during high tide or low tide when its at 1/12.
Hope that makes sense - best to check the tide tables for your area to find out when this is.
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If you are a man, its best to go when the temperature is above 80 degrees F so that you can avoid shrinkage problems.
You should go in the pool bettween 2-ish and 6 or 7-ish. But if your looking for the exact time than it depends on whether you want to go in the pool when its hot or a bit warm outside
When the tide is on its way in, better know as 'the push'. If you look up the tide times for the beach you want to surf at it will be the hours leading up to high tide time.
There are many occasions where it is okay to swim. When the pool is open for instance. Also, when there is a life guard.