The press release says it includes seasonal and temp workers, so the answer is surely yes. Besides, imagine if the answer were no. That would be easy to report on and then this big PR story would turn into a disaster.
Edit: Looks like the press release has been updated to make this explicit: Amazon today announced it is increasing its minimum wage to $15 for all full-time, part-time, temporary (including those hired by agencies), and seasonal employees across the U.S.
Edit: Looks like the press release has been updated to make this explicit: Amazon today announced it is increasing its minimum wage to $15 for all full-time, part-time, temporary (including those hired by agencies), and seasonal employees across the U.S.
https://www.businesswire.com/news/home/20181002005317/en/