September in Lanzarote is the warmest month of the year. In September, the weather in Lanzarote is typically warm. Average daily high temperature in September is about 22 degrees above zero. On average, Lanzarote has 26 sunny, 3 partly cloudy, and 1 rainy day in September. The rains are usually light. September as well as July, August, and October is considered the most comfortable time to visit Lanzarote.