North Stack
Island Sea stack off Anglesey popular with climbers
Off Anglesey’s Holyhead coast, North Stack is a sea-stack and cliff area favoured by experienced rock climbers, birdwatchers and coastal walkers exploring tidal platforms and geological strata.
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How to Get to North Stack #
North Stack (Ynys Arw) is accessed from Holyhead or the northwest coast of Anglesey. Visitors typically drive along the A55 to the town of Holyhead and follow local roads toward North Stack viewpoints and car parks; coastal footpaths lead to cliff edges and lookout points. Check tide times and local access signs before attempting coastal walks.
Tips for Visiting North Stack #
- Approach the stack by low tide if attempting coastal walks; routes can be slippery and tide-dependent.
- Rock climbers should check local access rules and sea conditions - North Stack is serious and exposed, not for the inexperienced.
- Bring binoculars for seabird colonies on the cliff faces - puffins and razorbills nest on nearby ledges in season.
Best Time to Visit North Stack #
Best in late spring and summer for milder weather and active seabird colonies, though conditions can change rapidly.
Late spring to summer
May-August · 10-18°C (50-64°F)
Best weather and seabird activity; longer daylight makes cliff access safer.
Autumn
September-October · 7-14°C (45-57°F)
Fewer visitors, dramatic weather but shorter days; sea conditions can worsen.
Weather & Climate near North Stack #
Climate
Temperature & Rainfall
Temperature Range
25°
Warmest Month
-2°
Coldest Month
Monthly Conditions
January
Weather
0.0
UV Index
Low
7.9h daylight
February
Weather
0.1
UV Index
Low
9.6h daylight
March
Weather
0.4
UV Index
Low
11.7h daylight
April
Weather
0.8
UV Index
Moderate
13.8h daylight
May
Weather
1.2
UV Index
High
15.7h daylight
June
Weather
1.4
UV Index
High
16.7h daylight
July
Weather
1.3
UV Index
High
16.2h daylight
August
Weather
1.0
UV Index
High
14.6h daylight
September
Weather
0.6
UV Index
Moderate
12.5h daylight
October
Weather
0.3
UV Index
Low
10.4h daylight
November
Weather
0.1
UV Index
Low
8.4h daylight
December
Weather
0.0
UV Index
Low
7.3h daylight
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