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 warm. Town Cove extends towards 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 can be as high as the lower 70's. The pic of me with the full suit on is this past June 2005. The water was in the lower 50's with a air temp of maybe 60 on a overcast day.