Can you swim at Portmarnock in August? — 16.0°C water
Yes, but expect a fresh dip
Average sea · August
16.0°C
Live water now
…
Recommended wetsuit
3/2mm fullsuit
mild
It depends. Portmarnock sits around 16.0°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 Portmarnock live page for full conditions.
Frequently asked questions
What is the average sea temperature at Portmarnock in August?
Portmarnock averages 16.0°C in August, based on long-run climatology for the Irish Sea.
Is the sea warm enough to swim at Portmarnock in August?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Portmarnock in August?
A 2 mm shorty is comfortable for sessions over 30 minutes.
