Taking the local weather in Gettnau into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually July and August, with an average temperature of 16°C, while the coldest months are January and February, with an average of 1°C. The rainiest months in Gettnau are June, May, July and August, with each month seeing an average of 187 mm of rainfall.