I go there often on a regular hot Summer days. But this summer has been just sad. It hasn't been warm enough to warm the water.
And I don't mean a heat (almost all of) the rest of the world experiences. Oh, no. Even our hottest days are usually quite tolerable, and won't last longer than a week. You'll survive by drinking enough liquids and getting your salt taken and wearing light-coloured clothes. I visited Barcelona in March and Chicago in June and I'll tell ya, the hot days in Chicago were just very different we ever get here. I'm actually rather sensitive to really hot days, they can even here make me sometimes have marathon headaches etc.
Barcelona in March was very much like the beginning of the Summer here - usually. Not this year though. When you swim the first time in a Summer in natural water in Finland, we say that you throw away your winter fur. I'm usually done with that by the middle of June, but this year - no way. I did finally get my butt into the nearby river last week.