Dublin has a mild humid temperate climate with warm summers and no dry season. The month of July is characterized by essentially constant daily high temperatures, with daily highs around 65°F (18°C) throughout the month, exceeding 71°F (22°C) or dropping below 59°F (15°C) only one day in ten.
The average probability that some form of precipitation will be observed in a given day is 74%, with little variation over the course of the month.
It is said that Ireland can experience all four seasons in one day, so keep this in mind & pack wisely. Include warm indoor & outdoor clothing. Plan for the sun, the wind, & the rain, and be able then to get out & enjoy it all, whatever the weather does!