Nearly 60 Massachusetts beaches are closed ahead of a beautiful weekend with temperatures rising into the 80s.

As of Friday night, 58 beaches across 36 towns are closed to swimmers due to dangerous bacteria levels and blue-green algae blooms, according to the Massachusetts Department of Public Health’s (DPH) interactive beach water quality dashboard . The closed beaches include both freshwater and ocean shorelines. However, the majority of closures are at freshwater ponds—only about 10 ocean beaches are closed.

The number of beach closures has nearly doubled since last month, up from 31 on July 25.

Under state law, local health departments must monitor bacteria levels at more than 1,100 public and semi-public beaches across Massachusetts. They test daily or monthly, depending on

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