St. Swithun's Day is celebrated on July 15th in honor of Saint Swithun, a 9th-century bishop of Winchester, England. According to legend, if it rains on this day, it is believed that the weather will remain wet for the next 40 days. Conversely, if the day is dry, it is thought that the following weeks will be dry as well. The day is rooted in folklore and has been observed for centuries. Many people still refer to the saying, "St. Swithun's Day, if thou dost rain, for forty days it will remain." This tradition reflects the connection between weather patterns and agricultural practices in rural communities.