The Thai Consulate in Germany can issue you with a Thai Visa for your stay in Thailand. Most Germans who arrive in Germany on holiday arrive with a tourist visa. Many simply do not rely on the visa on arrival so everyone makes their application for a proper visa back in Germany. The Consulate hours are not listed however you can call them to find out their office hours for visa applications. Most Germans prefer to use the Thai Embassy in Berlin as they are geared for the issuing of visas for Thailand.