Overview: WiesbadenExperience Wiesbaden's Temperate Oceanic Climate Throughout the Year. Home to glorious seasons, Wiesbaden, Germany, offers visitors a rich tapestry of weather experiences with temperatures ranging from a chilly 4.2 degrees Celsius in January to a warm 25.2 degrees in July. Rain is distributed fairly evenly across the months, though the summer months tend to be a touch wetter, ensuring the city remains lush and verdant. The fluctuating weather patterns present an ever-changing landscape, perfect for those seeking variety in their outdoor experiences. The cooler temperatures and reduced crowds can offer a more tranquil ambiance, making Wiesbaden a year-round destination for those wishing to immerse themselves in its elegance and historical charm.