Baltic sea is cold this time of year

So obviously I had some planes to swim in my dearest Baltic sea this year. I have these plannes every year for summer. Then I come here, in Estonia, and find out that the 3 coats (all different levels of warmth) that I packed with me are gonna be more in use than a swimming suit.
Also the swifts are gone, and that can mean only one thing- this summer is over! What will never change though - cold waters of my dearest sea.