Should I take this job?

Just graduated high school and just got hired for my first job. I would start next week and it is at the UPS store. However, I will be moving out of state September 22nd for college. I was just looking for a summer job but what is bothering me is how much he emphasized this being a long term position and that if I can't commit that I shouldn't take it. They also be sending me to a 1 day seminar to become a notary public. So I would be only working for a solid 3.5 months. On the other hand I know how hard it is to find a job these days. What do you suggest? Thanks!