July in May Pen is the windiest and the hottest month of the year. In July, the weather in May Pen is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, May Pen has 16 rainy, 14 sunny, and 1 partly cloudy day in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit May Pen.