July in Aberystwyth is the warmest month of the year. 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 23 rainy and 8 sunny days in July. The rains are usually moderate. July as well as January, February, May, and August is considered the most uncomfortable time to visit Aberystwyth.