Editor's note: On Thursday, July 25th, city authorities said it was once again safe to swim. Bathers are advised to look for signs and flags by swimming spots in case the situation changes.
The city council took to social media to ask people to avoid swimming "until further notice", while signs have been put up and black flags raised at the sites themselves.
This is after regular tests showed there was algal bloom in the water, which can produce toxins that are dangerous to people and animals, sometimes leading to rashes and stomach flu-like symptoms.
While the warm weather encourages many people to go for a dip outdoors, these weather conditions can also lead to overgrowth of algae.
Some of the affected swimming spots include Klagshamnsstranden, Ribersborgsstranden, Scaniabadet and Sundspromenaden in the Västra Hamnen area, Sibbarps saltsjöbad, and Sibbarpsstranden.
As for when it will be safe to swim again, it could be at least another day or two, but it's possible the beaches will be safe for bathers by the weekend.
Marie Persson from Malmö City's environmental department told Sydsvenskan: "We usually don't have this for more than a couple of days, then the wind blows it to other places. Now the weather is supposed to stay steady with calm winds, but I have no idea of the currents. Hopefully it will be no more than a few days."