July in Dublin is the rainiest, the cloudiest, and the warmest month of the year. In July, the weather in Dublin is typically warm. Average daily high temperature in July is about 16 degrees above zero. On average, Dublin has 27 rainy, 2 sunny, and 2 cloudy days in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Dublin.