"That's potentially down to the early start of the summer, warm weather and high numbers of people at the beaches."
Hawke's Bay has a 10-year average of two drownings a year.
Police spokeswoman Amelia Vaughan said the police use social media and other tools to help surf life saving staff notify the public when beaches were too dangerous for swimming.
"Signage will be posted where available and beach users will be approached and encouraged not to enter the water."
Surf life saving patrols are at Waipatiki, Westshore, Marine Parade in front of Ocean Spa, Ocean Beach and Waimarama.
They will patrol every day until January 28, then on weekends only until the end of February.