In the beginning of August it is the height of the summer in Gothenburg. Water temperatures area round 18 degrees C.
Like everywhere we can have wind, rain and un-seasonably cold weather. Make sure you bring clothes to handle this. The water on the West coast is salty.
In the water there are jelly fish. The white ones are harmless and the red ones sting. The sting is not very strong compared to the Mediterreanean jelly fish.