Inshore you have about 18 deg C, offshore probably 14 deg C.
I do not think water and air (about 18-20 deg C) temperature represent any problems this year as compared to the physical and mental strain of sailing and paddling (!) for hours (really days!) with the ever present risk of hitting rocks (and logs!). When following the fleet on Monday, I noticed some sailors taking high risks when entering shallow waters - I could not follow them with my inboard/ouboard drive...
Regards/Bengtos