The climate of Grainau is classified as warm and temperate. It receives a significant amount of rainfall that is evenly distributed throughout the year. However, to be specific summers receives the maximum rainfall. The climate chart of this municipality is defined in the following way:
Hence, the overall climate shows that Grainau can be visited anytime of the year. But to be specific spring and autumn is the best time to visit Grainau. This is because, you experience a mixture of hot and cold weather in both these seasons.