July in Clifden is the warmest month of the year. In July, the weather in Clifden is typically warm. Average daily high temperature in July is about 15 degrees above zero. On average, Clifden has 26 rainy, 4 sunny, and 1 cloudy day in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Clifden.