Carmarthen — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Carmarthen, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Carmarthen today is 20°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 | 20.2°C | 20.3°C | |
| JUL 17 | 20.1°C | 20.3°C | |
| JUL 18 | 20.1°C | 20.3°C | |
| JUL 19 | 20.1°C | 20.3°C | |
| JUL 20 | 19.8°C | 20.3°C | |
| JUL 21 | 19.9°C | 20.3°C | |
| JUL 22 | 19.9°C | 20.3°C | |
| JUL 23 | 20.0°C | 20.3°C | |
| JUL 24 | 20.3°C | 20.0°C | |
| JUL 25 | 20.3°C | 20.0°C | |
| JUL 26 | 20.3°C | 20.0°C | |
| JUL 27 | 20.3°C | 20.1°C | |
| JUL 28 | 20.3°C | 20.1°C | |
| JUL 29 | 20.3°C | 20.1°C | |
| JUL 30 | 20.3°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 | 2°C | 6°C | 9°C |
| February | 3°C | 7°C | 9°C |
| March | 5°C | 9°C | 11°C |
| April | 7°C | 11°C | 14°C |
| May | 9°C | 14°C | 18°C |
| June | 12°C | 19°C | 24°C |
| July | 15°C | 20°C | 25°C |
| August | 15°C | 19°C | 24°C |
| September | 13°C | 18°C | 22°C |
| October | 9°C | 13°C | 16°C |
| November | 5°C | 9°C | 11°C |
| December | 3°C | 7°C | 9°C |
Carmarthen: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
The Welsh county town of Carmarthen sits on the River Towy, a major waterway with water temperatures that fluctuate significantly throughout the year. As the river originates in the high Cambrian Mountains, it remains cool, typically dropping to a cold range of 3∘C to 7∘C (37∘F to 45∘F) during the winter. Even in summer, the water remains brisk, usually peaking around 16∘C to 20∘C (61∘F to 68∘F) in the lower, slower reaches near the town, making a full swim a bracing experience.
Swimming in the River Towy in and around Carmarthen is generally not permitted or advised due to significant hazards. Strong, unpredictable currents, especially after rain, and deep water areas pose serious safety risks like cold water shock and drowning. Furthermore, the river has been flagged for water quality concerns, including pollution from sewage discharges, which makes unsupervised bathing a health risk. Visitors to Carmarthen can instead explore the town's rich history, including its Roman past and the ruins of Carmarthen Castle. The beautiful National Botanic Garden of Wales and the coastal village of Llansteffan, overlooking the Towy estuary, are also popular nearby attractions.