Wetter (Ruhr) is a town in western Germany, in the federal state of North Rhine-Westphalia and the district of Ennepe-Ruhr-Kreis.

In 1819 Friedrich Harkort founded the first industrial workshop at Castle Wetter, producing steam engines and gas light equipment.

Due to the lowering bombardments in 1944/45, during the Second World War, the town became the domicile of the Reichsgau south-Westfalia, originally residing in Bochum.

In the most recent mayoral election on 13 and 27 September 2020, Hasenberg advanced to the runoff with 46.9% of votes against Karen Haltaufderheide of The Greens, who won 20.1%.

The most recent city council election was held on 13 September 2020, and the results were as follows: Wetter is twinned with South Elmsall (England), Turawa (Poland) and Stadtilm (Germany).