Can I teach English abroad in the summer?

Are there summer opportunities to teach English abroad? 
YES, however options will be more limited than if you were looking to teach English abroad for a year or even for six months.  Except for some short-term contract work, most language schools look to hire full-time teachers for 10-12 month contracts.  This means that most short-term opportunities for English teachers will be either in summer camps or in a volunteer capacity.