Taking the local weather in Heim 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 12°C, while the coldest months are January and December, with an average of -2°C. The snowiest months in Heim are December, January, February and March, with each month seeing an average of 36 cm of snowfall.