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Photo: Llyn Celyn dam and tower w.JPG via Wikidata Q3401399 License

Llyn Celyn

Reservoir

Cool today

Llyn Celyn (Welsh pronunciation: [ɬɨ̞n ˈkɛlɨ̞n]) is a reservoir constructed between 1960 and 1965 including the highly controversial Tryweryn flooding in the valley of the River Tryweryn in Gwynedd, Wales. This included the forcible removal of the Capel Celyn village residents despite protest and opposition of Welsh MPs. With an area of 320 hectares (1.2 sq mi), it measures roughly 2.5 miles (4.0 km) long by 1 mile (1.6 km) wide, and has a maximum depth of 140 ft (43 m).

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Weather at Llyn Celyn

H: 65° L: 45°
Sunny
Sunny
64°
|
Feels like 60°
Precipitation
7%
Humidity
46%
Wind
5 mph
UV Index
1.6
Water Conditions:
🥶Too cold for most swimmers
12 AM
Clear
47°
3 AM
Clear
46°
6 AM
Clear
45°
9 AM
Sunny
52°
12 PM
Sunny
60°
3 PM
Sunny
65°
6 PM
Sunny
62°
9 PM
Clear
51°

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Frequently asked questions

Where is Llyn Celyn?
Llyn Celyn is a reservoir in Wales.
Can you swim at Llyn Celyn?
There is no fixed answer for Llyn Celyn: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Llyn Celyn in Wales. Check current water conditions before you go, and follow posted signs and local guidance.

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Best Times to Visit

🧥
Right Now
Cool weather - dress warmly
🏞️ Lakes Tips:
  • Check for boat launch facilities and fees
  • Obtain required fishing licenses before arrival
  • Be aware of lake-specific regulations and restrictions
  • Monitor water quality reports before swimming
Best Seasons:
☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)

Location & Contact

Wales

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