Poulaphouca Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Poulaphouca Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Poulaphouca Reservoir today is 9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing can be used. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| OCT 28 | 10.0°C | 14.0°C | |
| OCT 29 | 9.8°C | 14.0°C | |
| OCT 30 | 9.9°C | 14.0°C | |
| OCT 31 | 9.7°C | 14.0°C | |
| NOV 1 | 10.1°C | 9.0°C | |
| NOV 2 | 9.8°C | 9.0°C | |
| NOV 3 | 9.3°C | 9.0°C | |
| NOV 4 | 9.0°C | 9.0°C | |
| NOV 5 | 9.0°C | 9.0°C | |
| NOV 6 | 9.0°C | 9.0°C | |
| NOV 7 | 9.0°C | 9.0°C | |
| NOV 8 | 9.0°C | 9.0°C | |
| NOV 9 | 9.0°C | 9.0°C | |
| NOV 10 | 9.0°C | 9.0°C | |
| NOV 11 | 9.0°C | 9.0°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 6°C | 9°C |
| February | 2°C | 6°C | 9°C |
| March | 3°C | 7°C | 10°C |
| April | 7°C | 11°C | 14°C |
| May | 10°C | 17°C | 22°C |
| June | 13°C | 21°C | 27°C |
| July | 16°C | 22°C | 28°C |
| August | 15°C | 21°C | 27°C |
| September | 13°C | 19°C | 24°C |
| October | 10°C | 14°C | 18°C |
| November | 5°C | 9°C | 12°C |
| December | 2°C | 6°C | 9°C |
Poulaphouca Reservoir: Water Temperature by Location
Poulaphouca Reservoir: Weather Forecast
November 5
November 6
November 7
November 8
November 9
Location & Local Information
Poulaphouca Reservoir, often known as the Blessington Lakes, is Ireland's largest man-made lake, created for hydroelectric power and water supply to Dublin. As with most inland Irish waters, the temperature remains quite cool. While exact readings vary, the surface temperature generally ranges from a chilly winter low of about 4∘C to 7∘C (39∘F to 45∘F), rising to a peak of roughly 14∘C to 17∘C (57∘F to 63∘F) during the summer months.
Swimming is strictly prohibited in the Poulaphouca Reservoir by its owners, the Electricity Supply Board (ESB). This ban is due to significant dangers unique to a man-made reservoir, including deep, fast-flowing currents, rapidly changing water levels (as water is drawn for power generation), and underwater hazards such as submerged tree stumps, old walls, and uneven ground from the drowned valley. Visitors are encouraged to enjoy other activities, such as kayaking, sailing, and walking the scenic Blessington Greenway or exploring the nearby Russborough House and the stunning landscape of the Wicklow Mountains National Park.