There's nothing like an all-inclusive holiday in Garmisch-Partenkirchen to rejuvenate you, especially when you know what kind of weather to expect. Here's some information to help you decide when to book: The hottest months are usually July and August, with an average temperature of 14°C, while the coldest months are January and February, with an average of -2°C. February and March are the driest months, while June and August are the rainiest months.