This is a very popular lake in the Gwydir Forest above Betws y Coed. Location given special mention as a great stargazing location on Snowdonia National Park website.
Weather forecast
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19/04/26
10° 8% -
19/04/26
10° 3% -
19/04/26
8° 0% -
20/04/26
5° 0%
Weather forecast for Blaenau Ffestiniog (9.7 miles away) updated 19/04/26 at 12:01. Powered by Met Office data.
Local light pollution
Llyn Geirionydd is estimated to have light pollution levels similar to a dark site location based on the latest data from the VIIRS satellite. For more advanced light pollution data, view this location on DarkSkySites.
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Urban
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Suburban
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Semi-rural
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Rural
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Dark site
The above demonstrates the estimated effect of light pollution - graphics created using Stellarium.
Best time to visit
The below chart shows when the skies will be at their darkest at this location and therefore the best time to visit. Moonlight is shown in light yellow and the Sun's twilight in light blue. Midnight on the date shown is shown as a white line with sunset to the left and sunrise the next morning to the right. A black background with stars shows the best times for stargazing. See our dark sky calendar for more details.
Sun 19th Apr
Mon 20th Apr
Tue 21st Apr
Wed 22nd Apr
Thu 23rd Apr
Fri 24th Apr
Sat 25th Apr
Find more dates
If you are planning to visit this location check our dark sky calendar to find out when is best!
CalendarEvents nearby
Stay and gaze nearby
Stay at one of these stargazing-friendly accommodation providers.