Clonmacnoise

Religious Site Ruined early-medieval monastic complex on River Shannon

Rising beside the River Shannon, Clonmacnoise preserves an early medieval monastery, round tower and carved high crosses. Visitors come to study monastic ruins, view the archaeological museum and absorb the riverine setting.

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Clonmacnoise is an early medieval monastic site on the east bank of the River Shannon in County Offaly, Ireland, founded in the 6th century by St Ciarán. It developed into a major ecclesiastical and scholarly centre during the early medieval period.

Established around the mid-6th century, Clonmacnoise expanded through the early Middle Ages and remained an important religious, cultural and burial site into the medieval period. The surviving stone work and sculpted crosses reflect centuries of ecclesiastical activity and refurbishment.

The monastic complex stands on the east bank of the River Shannon near the village of Shannonbridge in County Offaly and is accessible from regional roads.

  • Founding and chronology: Clonmacnoise was founded in the 6th century and became a major Irish monastic and learning centre; many of the surviving stone crosses and church ruins date from the early medieval and medieval periods.
  • Visitor facilities: A visitor centre near the entrance provides archaeological context and guided information about the crosses, tower and monastic layout; signage helps interpret the major monuments on the riverside site.

What to See #

  • Cross of the Scriptures: The Cross of the Scriptures, a decorated high cross that is one of the site's most prominent sculpted monuments dating to the early medieval period.
  • Round tower and cathedral ruins: A large stone round tower and the ruined cathedral and monastic church buildings, which represent structural phases from the 9th to the 12th centuries and later.
Clonmacnoise
Clonmacnoise, near Shannonbridge, County Offaly, Ireland
53.3239, -7.9911
Visitor centre typically 9:00am-5:00pm (seasonal; check locally)
€6-€8 (visitor centre/museum; variable, check locally)

How to Get to Clonmacnoise #

Clonmacnoise is signposted off the N62 between Athlone and Roscommon, close to Shannonbridge. It is a 20-30 minute drive from Athlone; limited local buses serve nearby towns but most visitors travel by car.

Tips for Visiting Clonmacnoise #

  • Start at the visitor centre to get your bearings; the interpretive displays situate the ruins in history and suggest short walking routes.
  • Don't miss the high crosses and the finely carved capitals in the ruins-these details are often overlooked by quick visitors.
  • Go late afternoon for low-angled light across the ruins; it's when the stonework gains depth and the site feels less crowded.

Best Time to Visit Clonmacnoise #

Late spring through early autumn for easiest access and full visitor services; off-season visits are quieter and more reflective.

Late spring-summer
May-August · 10-20°C
Warmer weather for walking between the ruins, visitor centre fully open and occasional guided tours available.
Autumn
September-October · 7-15°C
Quieter and atmospheric; mist on the Shannon adds to the mood but bring a rain layer.

Weather & Climate near Clonmacnoise #

Climate

Clonmacnoise's climate is classified as Oceanic - Oceanic climate with mild summers (peaking in July) and cold winters (coldest in January). Temperatures range from 2°C to 20°C. Moderate rainfall (924 mm/year), distributed fairly evenly throughout the year.

Air Quality: AQI 29 Good
Best Time to Visit
MayJuneJuly
Temperature & Rainfall
Temperature Range
27°
Warmest Month
-7°
Coldest Month
Monthly Conditions

January

January is the coolest month with highs of 8°C and lows of 2°C. Regular rainfall (92 mm) and mostly overcast skies.

44 Poor

Comfort

Feels Like Cold
C
Temperature
95%
Humidity
Very Humid

Weather

92 mm
Rainfall
4.0 m/s
Wind
Light Breeze
0.0
UV Index
Low
7.9h daylight

February

February is cold with highs of 8°C and lows of 2°C. Moderate rainfall (72 mm) and mostly overcast skies.

46 Poor

Comfort

Feels Like Cold
C
Temperature
93%
Humidity
Very Humid

Weather

72 mm
Rainfall
4.0 m/s
Wind
Light Breeze
0.2
UV Index
Low
9.6h daylight

March

March is cold with highs of 10°C and lows of 3°C. Moderate rainfall (71 mm) and mostly overcast skies.

54 Acceptable

Comfort

Feels Like Cold
C
Temperature
10°
91%
Humidity
Very Humid

Weather

71 mm
Rainfall
4.0 m/s
Wind
Light Breeze
0.4
UV Index
Low
11.7h daylight

April

April is cold with highs of 12°C and lows of 4°C. Moderate rainfall (58 mm) and mostly overcast skies.

56 Acceptable

Comfort

Feels Like Cold
C
Temperature
13°
87%
Humidity
Very Humid

Weather

58 mm
Rainfall
3.4 m/s
Wind
Light Breeze
0.8
UV Index
Moderate
13.8h daylight

May

May is cool with highs of 16°C and lows of 7°C. Moderate rainfall (59 mm) and mostly overcast skies.

66 Good

Comfort

11°
Feels Like Cool
11°C
Temperature
16°
84%
Humidity
Very Humid

Weather

59 mm
Rainfall
3.3 m/s
Wind
Light Breeze
1.2
UV Index
High
15.7h daylight

June

June is cool with highs of 18°C and lows of 9°C. Moderate rainfall (64 mm) and mostly overcast skies.

64 Good

Comfort

14°
Feels Like Cool
14°C
Temperature
18°
83%
Humidity
Very Humid

Weather

64 mm
Rainfall
3.1 m/s
Wind
Light Breeze
1.5
UV Index
High
16.7h daylight

July

July is cool with highs of 20°C and lows of 12°C. Moderate rainfall (65 mm) and mostly overcast skies.

64 Good

Comfort

16°
Feels Like Cool
16°C
Temperature
12° 20°
85%
Humidity
Very Humid

Weather

65 mm
Rainfall
3.0 m/s
Wind
Light Breeze
1.3
UV Index
High
16.2h daylight

August

August is cool with highs of 20°C and lows of 11°C. Regular rainfall (85 mm) and mostly overcast skies.

61 Good

Comfort

15°
Feels Like Cool
15°C
Temperature
11° 20°
86%
Humidity
Very Humid

Weather

85 mm
Rainfall
2.9 m/s
Wind
Calm
1.1
UV Index
High
14.6h daylight

September

September is cool with highs of 17°C and lows of 9°C. Moderate rainfall (79 mm) and mostly overcast skies.

62 Good

Comfort

13°
Feels Like Cool
13°C
Temperature
17°
88%
Humidity
Very Humid

Weather

79 mm
Rainfall
3.2 m/s
Wind
Light Breeze
0.7
UV Index
Moderate
12.5h daylight

October

October is cool with highs of 14°C and lows of 7°C. The wettest month with 95 mm of rain and mostly overcast skies.

54 Acceptable

Comfort

10°
Feels Like Cool
10°C
Temperature
14°
91%
Humidity
Very Humid

Weather

95 mm
Rainfall
3.4 m/s
Wind
Light Breeze
0.3
UV Index
Low
10.4h daylight

November

November is cold with highs of 10°C and lows of 4°C. Regular rainfall (92 mm) and mostly overcast skies.

52 Acceptable

Comfort

Feels Like Cold
C
Temperature
10°
94%
Humidity
Very Humid

Weather

92 mm
Rainfall
3.5 m/s
Wind
Light Breeze
0.1
UV Index
Low
8.4h daylight

December

December is cold with highs of 9°C and lows of 3°C. Regular rainfall (92 mm) and mostly overcast skies.

44 Poor

Comfort

Feels Like Cold
C
Temperature
95%
Humidity
Very Humid

Weather

92 mm
Rainfall
3.8 m/s
Wind
Light Breeze
0.0
UV Index
Low
7.3h daylight

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