Jetskiing Cape Cod. Most of the these pictures were taken in Cape Cod Bay outside Rock Harbor in Eastham, MA. Some others were taken in Town Cove and Nauset Inlet. Rock Harbor is in Cape Cod Bay were the waters are more calm and much warmer than the Atlantic Ocean. Town Cove extends into Nauset Inlet. Nauset inlet goes into the rougher and very chilly North Atlantic. Even in the middle of the summer you will want to wear a short wetsuit. In the summer the water can be anywere from 52-65 degrees. Were is Cape Cod Bay sea surface temps can be as high as the lower 70's. This pic is with the full race wetsuit on in June. The water was in the lower 50's with a air temp of maybe 60 on a overcast day.