Unfortunately not. Summer pretty much sucks there, and even if there is a decent swell (which is very unlikely) it will be breaking dodgy anyway.
Your best bet is to just hang on the South Shore, as they get good waves around this time of year.
Check out places like Sandy's, Makapuu's and Ala Moana Bowls especially pumps.
If you do want to get to the North Shore, it takes about an hour to get there from the South. You can take the bus for $2.25 to get anywhere around the island, runs all the time, but takes a lot longer because of heaps of stops on the way. Otherwise try and hook a lift somehow, although generally its not that easy, and forget the taxi's or shuttles, they cost a fortune.