On Tuesday, six beaches across five towns in Massachusetts were closed as temperatures began to rise, reaching the 70s. The Massachusetts Department of Public Health reported that two beaches in Dartmouth were closed due to a Combined Sewer Overflow (CSO) event, which occurs when heavy rainfall overwhelms sewage systems, leading to the discharge of wastewater into water bodies. In Natick, a beach was closed due to a harmful bloom of cyanobacteria, which can cause gastrointestinal issues and other serious health effects. The closures in Ashby, Plymouth, and Shutesbury did not have specified reasons. The DPH states that closures typically last one to two days to allow for lab testing and to ensure safety. Local health officials monitor over 1,100 public beaches for water quality, with testing frequency based on each beach's vulnerability. With warmer weather expected, including highs of 84 degrees on Thursday and 87 degrees on Friday, the situation remains dynamic for beachgoers in the state.