The water is polluted and the smell is unpleasant but they need a break from the oppressive heat at home - and there are few other options for a family on their budget with a power supply that only works four hours a day.
"We can see the sewage clearly, and we still come here - it costs us nothing," says Taha, 46.
"Life is depressing and difficult and people have no escape but the sea."
"We advise people not to go into the sea and to stay on the beach but they do not listen. We tell them the seawater is mostly polluted and they do not listen," said lifeguard Khader Abu Jreban.
Power shortages in the territory of two million people have severely disrupted operations at sewage treatment facilities, leading to the discharge of wastewater into the sea.
Gaza, whose main power supplier is Israel, has suffered problems with its electricity for the past decade.
Some citizens blame the shortages on a political rivalry between Hamas, the Islamist group that runs Gaza, and the Palestinian Authority based in the occupied West Bank. Others point an accusing finger at Israel, which along with Egypt imposes tight border restrictions.
U.N. figures showed 108 million litres of wastewater poured into the sea off Gaza every day in May. Pollution levels are four times higher than the international standard, according to the data.
"Water is treated with chlorine and the whole place is computerised," said Hani Abdelbari, the facility's executive director.
Vendors selling boiled corn and fried potatoes give visitors a taste of Gaza's traditional beach food.
"It is something that we were used to and lost," says Reham Shaik, out for a day with her three children.
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)