Pollaphuca Reservoir

Reservoir Large Leinster reservoir on River Liffey supplying Dublin

A Leinster reservoir popular with anglers, walkers and cyclists; the surrounding roads and trails make it a convenient day‑trip from Dublin for outdoor recreation.

Main image

Poulaphouca Reservoir, commonly called Blessington Lakes, is a large man-made lake on the River Liffey in Leinster, Ireland. It sits in the Wicklow/Kildare area and is a major freshwater storage and hydroelectric site for the region.

The lake was formed in the 20th century by damming the River Liffey to provide water supply and hydroelectric generation. The impoundment changed local land use by flooding low-lying areas and creating the present shoreline used for recreation.

The reservoir lies southwest of Dublin near the town of Blessington in eastern Ireland, occupying a broad valley where the River Liffey was impounded.

  • Viewpoints: Best light for photos is in the late afternoon when the low sun picks out the shoreline and islands.
  • Alternate name and function: The reservoir is often referred to locally as Blessington Lakes and serves both recreation and water-supply/hydropower functions for the region.

What to See #

  • Poulaphouca Dam: The dam that impounds the reservoir and its hydroelectric plant sit at the western end of the lake and are the primary built features for visitors to view.
  • Blessington Lakes: The area known as Blessington Lakes refers to the reservoir and surrounding shoreline popular for day trips and scenic drives from nearby towns.
Pollaphuca Reservoir
53.1333, -6.5167

How to Get to Pollaphuca Reservoir #

  • By car: Poulaphouca (Pollaphuca) Reservoir is reached from Dublin in roughly 35-45 km depending on start point - take the M50 southbound then follow the N81 west/southwest toward Blessington. From Blessington town follow local roads (R758/R759) to scenic parking and shore viewpoints.

  • By public transport / on foot: Regular commuter and regional buses run from Dublin (via Tallaght) to Blessington; from Blessington village the main lakeshore viewpoints and trails are typically a 1-3 km walk along local roads and minor tracks.

Tips for Visiting Pollaphuca Reservoir #

  • Visit early on weekday mornings to avoid heavy weekend traffic from Dublin and to enjoy calmer water for photography and fishing.
  • Park in Blessington village and follow the marked lakeside paths of the Blessington/Poulaphouca Greenway to reach scenic viewpoints without driving around the reservoir.
  • Explore quieter stretches of the eastern shoreline away from the main car parks for better vistas of the Wicklow hills that many day-trippers miss.

Best Time to Visit Pollaphuca Reservoir #

Best late spring to early autumn (May-September) for mild, pleasant conditions and outdoor activities.

Summer
June-August · 15-20°C
Mild and often the most pleasant for walking, boating and picnics; can be busy on weekends.
Shoulder seasons (Spring/Autumn)
April-May, September-October · 8-15°C
Cooler and wetter than summer but generally quiet-good for walks and birdwatching.
Winter
December-February · 2-8°C
Cool, often wet and windy; outdoor water activities are limited but crowds are minimal.

Weather & Climate near Pollaphuca Reservoir #

Climate

Pollaphuca Reservoir's climate is classified as Oceanic - Oceanic climate with cool summers (peaking in July) and cold winters (coldest in January). Temperatures range from 2°C to 18°C. Moderate rainfall (931 mm/year), distributed fairly evenly throughout the year.

Best Time to Visit
JuneJulySeptember
Temperature & Rainfall
Temperature Range
24°
Warmest Month
-4°
Coldest Month
Monthly Conditions

January

January is the coolest month with highs of 7°C and lows of 2°C. Regular rainfall (96 mm) and mostly overcast skies.

42 Poor

Comfort

Feels Like Cold
C
Temperature
92%
Humidity
Very Humid

Weather

96 mm
Rainfall
4.7 m/s
Wind
Light Breeze
0.0
UV Index
Low
7.9h daylight

February

February is cold with highs of 7°C and lows of 2°C. Moderate rainfall (72 mm) and mostly overcast skies.

46 Poor

Comfort

Feels Like Cold
C
Temperature
91%
Humidity
Very Humid

Weather

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

March

March is cold with highs of 9°C and lows of 3°C. Moderate rainfall (68 mm) and mostly overcast skies.

54 Acceptable

Comfort

Feels Like Cold
C
Temperature
89%
Humidity
Very Humid

Weather

68 mm
Rainfall
4.7 m/s
Wind
Light Breeze
0.4
UV Index
Low
11.7h daylight

April

April is cold with highs of 11°C and lows of 4°C. Moderate rainfall (62 mm) and mostly overcast skies.

54 Acceptable

Comfort

Feels Like Cold
C
Temperature
11°
87%
Humidity
Very Humid

Weather

62 mm
Rainfall
4.1 m/s
Wind
Light Breeze
0.8
UV Index
Moderate
13.8h daylight

May

May is cold with highs of 14°C and lows of 6°C. Moderate rainfall (66 mm) and mostly overcast skies.

56 Acceptable

Comfort

10°
Feels Like Cold
10°C
Temperature
14°
85%
Humidity
Very Humid

Weather

66 mm
Rainfall
3.9 m/s
Wind
Light Breeze
1.2
UV Index
High
15.7h daylight

June

June is cool with highs of 16°C and lows of 9°C. Moderate rainfall (61 mm) and mostly overcast skies.

64 Good

Comfort

13°
Feels Like Cool
13°C
Temperature
16°
85%
Humidity
Very Humid

Weather

61 mm
Rainfall
3.6 m/s
Wind
Light Breeze
1.5
UV Index
High
16.7h daylight

July

July is cool with highs of 18°C and lows of 11°C. Moderate rainfall (62 mm) and mostly overcast skies.

62 Good

Comfort

14°
Feels Like Cool
14°C
Temperature
11° 18°
86%
Humidity
Very Humid

Weather

62 mm
Rainfall
3.5 m/s
Wind
Light Breeze
1.3
UV Index
High
16.2h daylight

August

August is cool with highs of 18°C and lows of 11°C. Moderate rainfall (79 mm) and mostly overcast skies.

60 Good

Comfort

14°
Feels Like Cool
14°C
Temperature
11° 18°
87%
Humidity
Very Humid

Weather

79 mm
Rainfall
3.4 m/s
Wind
Light Breeze
1.1
UV Index
High
14.6h daylight

September

September is cool with highs of 16°C and lows of 9°C. Regular rainfall (87 mm) and mostly overcast skies.

62 Good

Comfort

12°
Feels Like Cool
12°C
Temperature
16°
88%
Humidity
Very Humid

Weather

87 mm
Rainfall
3.7 m/s
Wind
Light Breeze
0.7
UV Index
Moderate
12.5h daylight

October

October is cold with highs of 13°C and lows of 7°C. Regular rainfall (92 mm) and mostly overcast skies.

52 Acceptable

Comfort

10°
Feels Like Cold
10°C
Temperature
13°
89%
Humidity
Very Humid

Weather

92 mm
Rainfall
4.1 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 (86 mm) and mostly overcast skies.

52 Acceptable

Comfort

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

Weather

86 mm
Rainfall
4.2 m/s
Wind
Light Breeze
0.1
UV Index
Low
8.4h daylight

December

December is cold with highs of 8°C and lows of 2°C. The wettest month with 100 mm of rain and mostly overcast skies.

42 Poor

Comfort

Feels Like Cold
C
Temperature
92%
Humidity
Very Humid

Weather

100 mm
Rainfall
4.4 m/s
Wind
Light Breeze
0.0
UV Index
Low
7.3h daylight

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