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 15.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 25 | 14.8°C | 18.5°C | |
| JUN 26 | 15.1°C | 18.5°C | |
| JUN 27 | 15.4°C | 18.5°C | |
| JUN 28 | 15.4°C | 18.5°C | |
| JUN 29 | 15.0°C | 18.5°C | |
| JUN 30 | 15.3°C | 18.5°C | |
| JUL 1 | 15.6°C | 20.3°C | |
| JUL 2 | 15.5°C | 20.3°C | |
| JUL 3 | 20.3°C | 15.7°C | |
| JUL 4 | 20.3°C | 16.0°C | |
| JUL 5 | 20.3°C | 16.2°C | |
| JUL 6 | 20.3°C | 16.5°C | |
| JUL 7 | 20.3°C | 16.7°C | |
| JUL 8 | 20.3°C | 16.9°C | |
| JUL 9 | 20.3°C | 17.2°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 3
July 4
July 5
July 6
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.