In July, the weather in Aberystwyth is typically warm. Average daily high temperature in July is about 17 degrees above zero. On average, Aberystwyth has 18 rainy, 7 partly cloudy, 3 sunny, and 3 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 Aberystwyth.