Can you swim at Portmarnock in March? — 9.0°C water
Cold — wetsuit recommended
Average sea · March
9.0°C
Live water now
…
Recommended wetsuit
5/4mm fullsuit + boots & gloves
cold
Cold. 9.0°C in March is cold-water swimming territory — a 4/3 mm full wetsuit, neoprene cap and short, repeated sessions are the safe approach.
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 March?
Portmarnock averages 9.0°C in March, based on long-run climatology for the Irish Sea.
Is the sea warm enough to swim at Portmarnock in March?
Not without thermal protection — a wetsuit is recommended at 9.0°C.
Do I need a wetsuit at Portmarnock in March?
A 4/3 mm full wetsuit, boots and neoprene cap are recommended.
