Job Interview Questions: What to wear for summer Job interview?

Should I wear a suit or blazzer to job interview in the summer time? (as in this month)
or
Should I wear a shirt and tie only with no blazzer?

It's for sales/marketing for sports arena. (little detail)
Any suggestion would be great. Thank you

Job Interview Tips That Deliver

Recommended Answer:
Suit. Employers know what is considered the general rule of thumb for a job interview. (most of them at least) You want to wear a black 3 button business suit, with a white or blue shirt and a solid plain tie of a neutral color. They will always look at your appearance and if you follow the general dress code for an interview, they will consider you as someone who knows what you are doing.

Tips For Facing a Job Interview

• shirt and tie with no blazer.....its only a summer job.
  
  Edit: it doesnt matter, you should wear the blazzer, but you dont want to look very sweaty during the interview.