Ireland
East Coast · Irish Sea
Portmarnock
Long Dublin family beach.
Fresh water with a light chop and a moderate breeze — fresh conditions — a wetsuit is recommended.
Sea temperature now
17.0°Cmild
Fair
Updated just now · Source: Open-Meteo Marine
Air temperature
17.2°C
Wave height
0.5 m
Wind
20.2 km/h
UV index
3.7 UV index
Location
Portmarnock on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Wetsuit recommendation
3/2mm fullsuit
At 17.0°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports.
Surf & watersports
Spring/autumn conditions in temperate seas. A 3/2mm full wetsuit (3mm torso, 2mm limbs) is the most versatile thickness — warm enough for 2-hour sessions, flexible enough for paddling. Open-water swimmers should wear a triathlon-cut swim wetsuit.
Open-water swimming
A triathlon-style swim wetsuit keeps you warm for 45–60 minutes.
Recommendation tuned for Portmarnock's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Quick answer
Can I swim at Portmarnock today?
The sea is currently 17.0°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.
Key takeaways
- • Located in East Coast, Ireland (Irish Sea).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Year-round sea temperature
| Month | Sea | Comfort |
|---|---|---|
| Jan | 10°C | Cold |
| Feb | 9°C | Cold |
| Mar | 9°C | Cold |
| Apr | 10°C | Cold |
| May | 11°C | Cold |
| Jun | 13°C | Cold |
| Jul | 15°C | Bracing |
| Aug ⭐ | 16°C | Bracing |
| Sep | 15°C | Bracing |
| Oct | 14°C | Bracing |
| Nov | 12°C | Cold |
| Dec | 11°C | Cold |
Can you swim here? — Portmarnock
Warmer nearby
Same region this month — East Coast
Nearby beaches
The closest coastline, with live water temperatures.