Glendalough Lakes — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Glendalough Lakes, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Glendalough Lakes today is 12.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| JUN 3 | 13.8°C | 18.8°C | |
| JUN 4 | 13.6°C | 18.8°C | |
| JUN 5 | 13.6°C | 18.8°C | |
| JUN 6 | 13.1°C | 18.8°C | |
| JUN 7 | 12.6°C | 18.8°C | |
| JUN 8 | 12.8°C | 18.8°C | |
| JUN 10 | 12.6°C | 18.8°C | |
| JUN 11 | 18.8°C | 12.8°C | |
| JUN 12 | 18.8°C | 13.1°C | |
| JUN 13 | 18.8°C | 13.4°C | |
| JUN 14 | 18.8°C | 13.8°C | |
| JUN 15 | 18.8°C | 14.1°C | |
| JUN 16 | 18.8°C | 14.4°C | |
| JUN 17 | 18.8°C | 14.7°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 | 0°C | 3°C | 7°C |
| February | 0°C | 4°C | 8°C |
| March | 2°C | 6°C | 9°C |
| April | 6°C | 10°C | 13°C |
| May | 10°C | 16°C | 22°C |
| June | 12°C | 19°C | 25°C |
| July | 16°C | 21°C | 26°C |
| August | 16°C | 21°C | 26°C |
| September | 11°C | 17°C | 22°C |
| October | 8°C | 12°C | 15°C |
| November | 3°C | 7°C | 11°C |
| December | 3°C | 6°C | 9°C |
Glendalough Lakes: Water Temperature by Location
Glendalough Lakes: Weather Forecast
June 9
June 10
June 11
June 12
June 13
June 14
Location & Local Information
The stunning Glendalough Lakes, nestled within the glacial valley of the Wicklow Mountains National Park, are known for their cool, dark waters. As deep mountain lakes, they experience significant seasonal temperature variations. During the winter months, the water can be extremely cold, dropping to around 5∘C to 7∘C (41∘F to 45∘F). In the height of summer, the surface water of the Upper Lake can warm up, though remaining refreshing, typically reaching 10∘C to 14∘C (50∘F to 57∘F).
Wild swimming is permitted in the Glendalough lakes, particularly at the Upper Lake, which is a popular spot in summer. However, visitors are strongly cautioned that these are unsupervised mountain waters with no lifeguards, sudden and dramatic depth changes, and persistently cold temperatures below the surface. Safety warnings emphasize the need for close supervision, especially for children. Beyond the lakes, the area is famed for the sixth-century Monastic City established by St. Kevin, featuring the iconic Round Tower, and an extensive network of challenging hiking trails, including the highly popular Spinc Loop.