Taking the local weather in South Haven 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 20°C, while the coldest months are January and February, with an average of -7°C. The snowiest months in South Haven are March, January, February and October, with each month seeing an average of 15 cm of snowfall.