September in Calheta is the warmest month of the year. In September, the weather in Calheta is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Calheta has 22 sunny, 6 partly cloudy, and 2 rainy days in September. The rains are usually light. September as well as July and August is considered the most comfortable time to visit Calheta.