Lake Vyrnwy — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Vyrnwy, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Vyrnwy today is 19.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| JUL 16 | 20.4°C | 21.0°C | |
| JUL 17 | 19.9°C | 21.0°C | |
| JUL 18 | 19.9°C | 21.0°C | |
| JUL 19 | 19.9°C | 21.0°C | |
| JUL 20 | 19.9°C | 21.0°C | |
| JUL 21 | 19.6°C | 21.0°C | |
| JUL 22 | 19.6°C | 21.0°C | |
| JUL 23 | 19.6°C | 21.0°C | |
| JUL 24 | 21.0°C | 19.7°C | |
| JUL 25 | 21.0°C | 19.7°C | |
| JUL 26 | 21.0°C | 19.8°C | |
| JUL 27 | 21.0°C | 19.9°C | |
| JUL 28 | 21.0°C | 20.0°C | |
| JUL 29 | 21.0°C | 20.0°C | |
| JUL 30 | 21.0°C | 20.1°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 | 6°C |
| February | 0°C | 4°C | 7°C |
| March | 2°C | 6°C | 9°C |
| April | 6°C | 10°C | 13°C |
| May | 10°C | 16°C | 22°C |
| June | 13°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 | 10°C |
| December | 0°C | 4°C | 7°C |
Lake Vyrnwy: Water Temperature by Location
Lake Vyrnwy: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Lake Vyrnwy, an expansive reservoir created by a Victorian dam in Mid Wales, offers a dramatic and beautiful setting but is not an open swimming location. As a drinking water supply, the lake has strict prohibitions against swimming to protect water quality, and the sheer depth and hidden machinery near the dam present significant safety hazards. Due to its size and location, the water temperature remains consistently cold throughout the year. Even in the peak summer months, surface temperatures typically only range from 12∘C to 16∘C (54∘F to 61∘F), while in winter the temperature plummets to single figures, often between 4∘C and 8∘C (39∘F to 46∘F).
While swimming is strictly forbidden, visitors can enjoy the water for supervised activities such as kayaking, sailing, and paddleboarding at the designated adventure centre. The area is also a major attraction for nature lovers, surrounded by a large RSPB nature reserve which offers fantastic birdwatching and numerous walking and cycling trails. Other nearby points of interest include the stunning Pistyll Rhaeadr Waterfall, one of the Seven Wonders of Wales, and the historic Powis Castle and Garden to the east.