Hot and dry July (Julius) has Romans focusing on the Gods of Water. The major festival for Neptune, the God of the Waters, is held in July. Also, Apollo, as the God of Healing, has games held in his honor. (Before the calendar reforms of Julius Caesar, July was Quinctilis, the fifth month. Later it was renamed for Caesar, himself.)
On the advice of the Sibylline Books, Romans held games for Apollo for to ask for help in the Second Punic War (212 BCE). They had just experienced several major defeats. Then later, the games became yearly to thank Him for his help in ending a city wide plague. The Ludi Apollinares (Apolline Games) are held from July 6 to 13. They include theater performances, games, and fairs. People would wear garlands and feast at the entrances of their homes.
Apollo was first considered to be a God of Healing by the Romans. Since He was a Greek God, his temples were built outside of the official boundary of Rome. During the Empire, the Romans also considered Him to be a God of Bards and Diviners. (Sol Indiges is the Roman Sun God.)
The second Parilia is held on July 7. (The April Parilia is for small livestock. God of the Month: Pales.) The July Parilia is for sheep and cattle. Animals and their pens are cleaned out and smudged with sulfur. Pales are/is the God/s of Livestock.
Neptune and Furrina
Coming into the driest part of the summer, the Romans were concerned about their water supplies. Held on July 23, the Neptunalia celebrates Neptune in his role as the God of Irrigation. Neptune (Neptunus) is the God of Fresh Water, and Salacia, the Goddess of Salt Walter, is regarded to be His Wife. (Neptunus Oceanus is Neptune of the Oceans.) On July 25, the Furrinalia was held for the Goddess Furrina, who watched over wells and other underground water sources. Modern Roman polytheists hold ceremonies to thank both Gods for water.