it was 65 on Sunday at Sagauro and 64 at Roosevelt last Sunday. It's actually not bad. I'm pretty much a wimp with cold water, since I grew up in Hawaii and have not been wearing a drysuite or wetsuite. However, 65 is a tiny bit cold when you first get in, but refreshing during the entire ride.
Just wait till the water hits in the 90's during the hot summer.
My water temp gauge read 94 one day last year.