Can you swim at Derrynane in December? — 11.0°C water
Cold — wetsuit recommended
Average sea · December
11.0°C
Live water now
…
Recommended wetsuit
5/4mm fullsuit + boots & gloves
cool
Cold. 11.0°C in December 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 Derrynane live page for full conditions.
Frequently asked questions
What is the average sea temperature at Derrynane in December?
Derrynane averages 11.0°C in December, based on long-run climatology for the Celtic Sea.
Is the sea warm enough to swim at Derrynane in December?
Not without thermal protection — a wetsuit is recommended at 11.0°C.
Do I need a wetsuit at Derrynane in December?
A 4/3 mm full wetsuit, boots and neoprene cap are recommended.
