Actually... summer is the PERFECT time for you to learn to surf. Would your rather learn in the winter, in your 5 mil, in rifling barrels, falling face first into 40 degree water 50 times a session?
To give you the best answer, we need to know where you live/what beach you'll be learning at, how much time you plan on dedicating to learning, and what your budget is.
any board over 8ft long... don't waste your time with a shortboard if your only gonna surf in the summer. maybe one of the foam boards... you know, the big yellow ones...
i got a 7'4" wrv funshape. pretty good to learn on if your gonna go to a shorty. ill let it go pretty cheap justs sits in my garage anyways. also dont hate on jersey waves do some research youll learn soon enough. pm if your interested in the board.