Swimming :

It’s really great to swim in an ocean, at the time you go to Morocco (agadir) at any season the water is Kind cold, but it is great fun! At the beach you will notice many locals playing foot ball or jogging, everybody loves sports in this country!

Swim suits and a pair of shorts and lots of sun screen lotion!

Many visitors, especially those who never saw any ocean, may expect very warm water in the Atlantic ocean in Agadir. In real it's not as warm as at the Mediterranean Sea for example. It was warm enough to enjoy it in October although some folks may like warmer one. Better use a swimming pool at your hotel in that case.
but keep in mind its absolutely great beach with quite big waves in which you enjoy swimming .