Dalkey Island Island
Small Irish island with medieval ruins and seals
Small island off Dublin reached by boat trips; archaeological ruins, a Martello tower, seabirds and coastal walks make it a popular day‑trip.
Dalkey Island at a Glance#
Address: Dalkey Island, County Dublin, Ireland
About Dalkey Island#
Dalkey Island is a small island off the coast of Dalkey in County Dublin, Ireland, known for its archaeological remains and coastal views. The island contains the ruins of an early medieval church and a 19th-century Martello tower among other historic features.
The island’s visible features include the remnants of St Begnet’s church and burial sites that reflect early Christian and medieval use, together with the Martello tower built during the 19th century for coastal defence. Visitors commonly go ashore by private boat or organised small-boat tours from nearby harbours.
Historically the island was used for settlement and burial in the early medieval period and later as part of coastal defence systems in the Napoleonic era. Its archaeological record and coastal position have made it a recurrent point of local maritime activity.
Geographically it lies in Dublin Bay about 1 kilometre from the mainland at Dalkey, within County Dublin and approximately 13 kilometres south of central Dublin.
- Access and distance: Located about 1 kilometre off the Dalkey headland and roughly 13 kilometres south of Dublin city centre, it is commonly reached by private boat or local boat operators from Coliemore Harbour.
- Why visit: Home to archaeological remains spanning early Christian through medieval periods and small seabird colonies, making it of interest to both heritage visitors and naturalists.
What to See#
- St Begnet’s Church ruins: Ruins of an early medieval Christian chapel and church remains dating from the medieval period, visible on the island and reflecting its historic religious use.
- Martello tower: A 19th-century Martello tower constructed for coastal defence that remains a prominent landmark on the island.
How to Get to Dalkey Island#
Small boats and local tour operators depart from Coliemore Harbour in Dalkey for short crossings to Dalkey Island. Check schedules and weather; landings can be dependent on sea conditions.
Tips for Visiting Dalkey Island#
- Check tide and boat schedules; accessing Dalkey Island often involves small private boats departing from Coliemore Harbour.
- Explore the medieval ruins and the Martello tower - both compact and evocative of maritime history.
- Bring sun protection and water; shade is limited and the island can be exposed on windy days.
Best Time to Visit Dalkey Island#
Dalkey Island is easiest to visit in summer when boat crossings are most reliable; always check local operators and tide conditions.
Weather & Climate near Dalkey Island#
Continental climate with mild summers (peaking in July) and cold winters (coldest in January). Temperatures range from 2°C to 20°C. Moderate rainfall (763 mm/year), distributed fairly evenly throughout the year.
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | Poor | 2° - 8° | 1° | 74 mm | overcast | 91% | 6.4 m/s | 0.0 low | 7.9h |
| February | Poor | 2° - 8° | 1° | 61 mm | overcast | 90% | 6.1 m/s | 0.2 low | 9.6h |
| March | Acceptable | 3° - 10° | 3° | 57 mm | overcast | 88% | 6.0 m/s | 0.4 low | 11.7h |
| April | Acceptable | 4° - 12° | 5° | 49 mm | overcast | 86% | 5.2 m/s | 0.8 moderate | 13.8h |
| May | Acceptable | 7° - 15° | 11° | 47 mm | overcast | 84% | 4.9 m/s | 1.2 high | 15.7h |
| June | Good | 10° - 18° | 14° | 56 mm | overcast | 84% | 4.5 m/s | 1.5 high | 16.7h |
| July | Good | 12° - 20° | 16° | 56 mm | overcast | 85% | 4.4 m/s | 1.3 high | 16.2h |
| August | Good | 11° - 19° | 15° | 72 mm | overcast | 86% | 4.4 m/s | 1.1 high | 14.6h |
| September | Good | 10° - 17° | 13° | 64 mm | overcast | 87% | 5.0 m/s | 0.7 moderate | 12.5h |
| October | Acceptable | 7° - 14° | 11° | 75 mm | overcast | 88% | 5.6 m/s | 0.3 low | 10.4h |
| November | Acceptable | 4° - 10° | 4° | 74 mm | overcast | 90% | 5.7 m/s | 0.1 low | 8.4h |
| December | Poor | 3° - 8° | 2° | 78 mm | overcast | 91% | 6.2 m/s | 0.0 low | 7.3h |
