July in Portlaoise is the cloudiest and the warmest month of the year. In July, the weather in Portlaoise is typically warm. Average daily high temperature in July is about 17 degrees above zero. On average, Portlaoise 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 Portlaoise.