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Photo: Llyn Cwmorthin, llyn yn y Moelwynion yng Ngwynedd - a lake nr Blaenau Ffestiniog, Gwynedd, Wales 08.jpg via Wikidata Q13129751 License
Llyn Cwmorthin
Lake
Rainy today
Editor's Notes
Llyn Cwmorthin fills a hanging valley above Tanygrisiau near Blaenau Ffestiniog, surrounded by the evocative ruins of a vast slate quarrying community — terraced barracks, a roofless chapel and tramway inclines — that earned the lonely cwm the nickname 'the valley of the lost'.
lake in Gwynedd, Wales
Interactive map not available
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Weather at Llyn Cwmorthin
45°F, Light rain · H 45° / L 40° · 90% chance of rain3-day forecast
H: 45° L: 40°
Light rain
45°
|
Feels like 42°
Precipitation
90%
Humidity
94%
Wind
2 mph
UV Index
0.1
Weather notes:
🌧️Rain expected
12 AM
41°
3 AM
40°
6 AM
43°
9 AM
44°
12 PM
45°
3 PM
45°
6 PM
44°
9 PM
42°
Frequently asked questions
- Where is Llyn Cwmorthin?
- Llyn Cwmorthin is a lake in Wales.
- Can you swim at Llyn Cwmorthin?
- There is no fixed answer for Llyn Cwmorthin: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Llyn Cwmorthin in Wales. Check current water conditions before you go, and follow posted signs and local guidance.
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Location & Contact
Wales
🏞️ Best times & visiting 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
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