Visiting local bars in Andermatt is more fun when you know what the weather holds. These rainfall averages and temperatures can help you choose the best time for bar-hopping. The hottest months are usually July and August, with an average temperature of 11°C, while the coldest months are January and February, with an average of -5°C. The rainiest months in Andermatt are August, July, June and May, with each month seeing an average of 265 mm of rainfall.