Planning for the weather is a good way to make your trip to Buchau relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 15°C, while the coldest months are January and February, with an average of -1°C. The rainiest months in Buchau are June, August, May and July, with each month seeing an average of 252 mm of rainfall.