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 12.6°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 4 | 13.0°C | 18.5°C | |
| JUN 5 | 13.0°C | 18.5°C | |
| JUN 6 | 13.0°C | 18.5°C | |
| JUN 7 | 13.0°C | 18.5°C | |
| JUN 8 | 13.0°C | 18.5°C | |
| JUN 10 | 13.0°C | 18.5°C | |
| JUN 11 | 12.7°C | 18.5°C | |
| JUN 12 | 18.5°C | 12.9°C | |
| JUN 13 | 18.5°C | 13.2°C | |
| JUN 14 | 18.5°C | 13.5°C | |
| JUN 15 | 18.5°C | 13.8°C | |
| JUN 16 | 18.5°C | 14.1°C | |
| JUN 17 | 18.5°C | 14.4°C | |
| JUN 18 | 18.5°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 | 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 | 16°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
June 12
June 13
June 14
June 15
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.