Sharks love overcast sky and less clear water like storm periods. They come in closer and are more game.

To fight the Lionfish plague in the Caribbean, they began feeding sharks the lionfish off the tips of their spears.The sharks would eat them, via head first and this seemed like a successful act of making lionfish a target for sharks.
Trouble was, that the sharks associated the lionfish with humans and within a year, sharks were aggressively targeting divers for food, then biting the divers themselves.

When I was hanging out in Stewart Island, NZ. The local knowledge of diving with Great Whites in the strait, was that they were shy and harmless, in subordination to the local Orca. Divers had no trouble.
Then some group from the Bluff began 'research'. That research was for Cage Diving Tourism. They were chuming and feeding the Great Whites, to bring them to the cages. In 8 years, locals on both sides of the strait were angry as hell, as the Great Whites associated food & humans together as they had become aggressive, banging boats and tinnies, like seagulls for a chip. It was no longer deemed safe to open dive, as the Great Whites would also bump divers from out of nowhere.

Duh dum.
Duh ...dum.
Duh dum... duh dum... duh duh duh dum dum dum.