Wetter lies in the Marburg-Biedenkopf district on the western edge of the Burgwald, a low range of hills, in the Wetschaft valley and neighbouring places about 14 km north of Marburg.

North to south through the town's municipal area runs the Federal Highway (Bundesstraße) B 252 from eastern Westphalia by way of Korbach and Frankenberg and on to Göttingen (in the community of Lahntal).

To divert heavy traffic away from places in the Wetschaft valley, a bypass road is planned.

The Kurhessenbahn which runs the line means to reopen the extension between Frankenberg and Korbach.

As of municipal elections held on 26 March 2006, the seats on Wetter Town Council are apportioned thus: Wetter's civic coat of arms might be described thus: In Or on a three-knolled hill vert a fleur-de-lis twig vert with three blossoms argent flanked by two inescutcheons, dexter in azure the Hessian Lion rampant gules and argent sinister; sinister in gules the wheel of Mainz argent.