BTW if the water is 55 degrees at the end of May its not a beach. Its the edge of a glacier.
SoCal beach water is around 58 or so now, and will only ever warm up to mid 60s in the summer.
One of the teachers at the school where I teach is a life guard. He told me that the water temps went down quite a bit.
The water temps were 55 although the air temps were in the mid 80 to low 90's.
Quite a few of the kids told me it was too hot for the beach but too cold to jump in the water to cool off.
Water temps..
I was just guessing when I said 55f. The actual water temp is 44!!!
http://www.weather.com/maps/activity/boatbeach/northeastuscoastalwatertemps_large.html