Caher Island

Island Uninhabited island with early Christian monastic ruins

A rocky Atlantic outcrop off County Mayo, Caher Island sees boat visitors for seabird colonies, rough coastal scenery and the ruins of early medieval monastic settlements accessed by experienced boat operators.

Caher Island is an uninhabited island off the west coast of County Mayo in Ireland. It is one of several small islands situated off the Mayo coastline.

The island has no permanent population and contains coastal terrain and rock features typical of the region. It is visited occasionally for wildlife observation and small boat landings.

Historically small offshore islands in this area were used intermittently for grazing and seasonal activities, and some contain ruins or traces of older occupation, though specific archaeological details vary by island.

The island sits off the rugged western coast of County Mayo in the province of Connacht, exposed to the Atlantic Ocean and separated from the mainland by short coastal channels.

Caher Island
Caher Island (Cathair), off the coast of County Mayo, Ireland
53.7178, -10.0289
Accessible by small boat (weather dependent)
No formal admission

How to Get to Caher Island #

Boat charters depart from Cleggan or nearby piers on the Mayo coast; crossings are weather dependent and should be arranged with experienced local skippers. Landing is on a small rocky shore; expect to wade during lower tides.

Tips for Visiting Caher Island #

  • Arrange boat transport from nearby ports (e.g., Cleggan or Roonagh) early in the day when seas are calmer.
  • Respect that Caher Island is used for pilgrimage: keep noise low and avoid disrupting any local rituals or grazing animals.
  • Bring cash for local skippers-there are no formal ferry services and pick-up times depend on tides.

Best Time to Visit Caher Island #

Best visited in late spring and summer for calmer seas and access by small boat; weather can be unpredictable.

Summer
June-August · 10-18°C
Best weather window for small-boat crossings and pilgrimages; long daylight.
Late spring
May · 8-14°C
Less crowded and good weather if seas permit.

Weather & Climate near Caher Island #

Climate
Temperature & Rainfall
Temperature Range
26°
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

Nearby Attractions to Caher Island