A mother says a recent visit to the San Antonio Aquarium ended with an octopus latching onto her son’s arm at an exhibit.

San Antonio usually records less than six inches of rainfall in June and July combined. “One of my colleagues has been here since the mid-90s and he called this a top-10 event,” Mr. Morris said.

San Antonio received 5.6 inches of rain in just three hours shortly after midnight — nearly 4 inches of that rain fell in a single hour. The city typically records just over 3 inches of rain in ...