August in Tombstone is the rainiest and the cloudiest month of the year. In August, the weather in Tombstone is typically hot. Average daily high temperature in August is about 31 degrees above zero. On average, Tombstone has 14 rainy, 14 sunny, and 3 partly cloudy days in August. The rains are usually moderate. August as well as July is considered the most uncomfortable time to visit Tombstone.