It depends. Grenen sits around 18.0°C in August; confident swimmers will be fine, casual bathers may prefer short sessions.
Monthly averages set expectations, but the specific beach today depends on wind, swell and recent weather. Check the live value at the top of this page or open the Grenen live page for full conditions.
Frequently asked questions
What is the average sea temperature at Grenen in August?
Grenen averages 18.0°C in August, based on long-run climatology for the Baltic Sea.
Is the sea warm enough to swim at Grenen in August?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Grenen in August?
A 2 mm shorty is comfortable for sessions over 30 minutes.
