Taking the local weather in Häggenschwil into account can help you maximise your time at the pool during your trip. The hottest months are usually July and August, with an average temperature of 17°C, while the coldest months are January and February, with an average of 1°C. The rainiest months in Häggenschwil are August, June, July and May, with each month seeing an average of 183 mm of rainfall.