A rash of beach closures south of Boston in the past two months can be attributed to dry summer weather followed by heavy rains, but, overall, beaches on the South Shore and along the south coast are cleaner than they’ve ever been, officials say.

Last week, all four sections of Wollaston Beach in Quincy were closed after testing showed elevated levels of bacteria. Beaches are closed if they have bacteria readings higher than 104 colony-forming units per 100 milliliters of water. The results of tests conducted last Sunday showed the Channing Street beach was more than six times the limit, Milton Street was 3 times over the limit, Rice Road more than four times, and Sachem Street was more than 12 times the limit.