Wetterhorn, Mountain peak in Grindelwald, Switzerland.

The Wetterhorn is a 3,690-metre peak in the Bernese Alps above Grindelwald. It is the highest of the Wetterhörner, a group of three summits that also includes the Mittelhorn (3,702 m, the highest point of the massif) and the Rosenhorn (3,689 m). From Grindelwald, the Mittelhorn and Rosenhorn are mostly hidden from view.

The first recorded ascent took place on August 31, 1844, when guides Hans Jaun and Melchior Bannholzer reached the summit. This milestone helped establish Switzerland as a center for modern mountaineering.

The name Wetterhorn ("weather horn") reflects its reputation for sudden storms. In 1868 Christian Almer guided Meta Brevoort and W. A. B. Coolidge here, and in 1896, aged 74, he climbed it with his 75-year-old wife Margaritha to mark their golden anniversary on the summit.

The Wetterhorn is climbed from Grindelwald via the Glecksteinhütte at 2,316 metres, a hut with beds and meals. The summit is a long, steep ascent on rock and snow, so plan for a pre-dawn start and check conditions with local guides. The Grosse Scheidegg pass north of the peak offers a lower-level route.

The summit was meant to be the terminus of the world's first passenger-carrying aerial tramway, but only the first quarter was built. It ran from 1908 to 1915, when operations stopped at the start of World War I.