Can I swim at Llanddwyn right now?

The sea at Llanddwyn is currently 17.7°C — fresh swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.

What will the sea temperature be at Llanddwyn next week?

Based on long-term June averages and the latest marine model, expect the sea around Llanddwyn to sit close to 15.4°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.

When is the best month to swim at Llanddwyn?

July – August – September are typically the warmest months to swim at Llanddwyn, with sea temperatures at their seasonal peak.

Do I need a wetsuit at Llanddwyn?

With water currently at 17.7°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.

United Kingdom

Wales · Irish Sea

Llanddwyn

Anglesey pine-backed island beach.

Fresh water with a light chop and a moderate breeze — fresh conditions — a wetsuit is recommended.

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Sea temperature now

17.7°Cmild

Fair

Updated just now · Source: Open-Meteo Marine

Air temperature

16.0°C

Wave height

1.0 m

Wind

19.4 km/h

UV index

4.5 UV index

Location

Llanddwyn 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 17.7°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 Llanddwyn's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.

Quick answer

Can I swim at Llanddwyn today?

The sea is currently 17.7°C — fair swimming conditions. Acclimatised swimmers will be most comfortable.

Key takeaways

• Located in Wales, United Kingdom (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.

Jan9°C Feb8°C Mar8°C Apr9°C May11°C Jun14°C Jul16°C Aug17°C Sep16°C Oct14°C Nov12°C Dec10°C

8°C → 17°C· Current month outlined· “Best” = within 2°C of the annual peak

Year-round sea temperature

Month	Sea	Comfort
Jan	9°C	Cold
Feb	8°C	Cold
Mar	8°C	Cold
Apr	9°C	Cold
May	11°C	Cold
Jun	14°C	Bracing
Jul	16°C	Bracing
Aug ⭐	17°C	Bracing
Sep	16°C	Bracing
Oct	14°C	Bracing
Nov	12°C	Cold
Dec	10°C	Cold