Tenby — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Tenby (Wales, United Kingdom). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Tenby help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Tenby in the Celtic Sea today is 19°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
Water temperature in Tenby has risen over the last week and month. Currently, the sea water at this location is slightly warmer than average for this day in previous years.
According to our forecast, Water temperature in Tenby will be 17.8°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUL 18 | 18.7°C | 17.3°C | |
| JUL 19 | 18.7°C | 17.5°C | |
| JUL 20 | 18.9°C | 17.3°C | |
| JUL 21 | 18.8°C | 17.3°C | |
| JUL 22 | 18.6°C | 17.8°C | |
| JUL 23 | 18.7°C | 17.8°C | |
| JUL 24 | 18.7°C | 17.5°C | |
| JUL 25 | 18.4°C | 17.3°C | |
| JUL 26 | 18.9°C | 17.3°C | 18.9°C |
| JUL 27 | 16.5°C | 18.7°C | |
| JUL 28 | 16.8°C | 18.6°C | |
| JUL 29 | 16.3°C | 18.4°C | |
| JUL 30 | 17.0°C | 18.3°C | |
| JUL 31 | 16.0°C | 18.1°C | |
| AUG 1 | 17.3°C | 17.9°C | |
| AUG 2 | 17.5°C | 17.8°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.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Tenby is a coastal town in Pembrokeshire, Wales, known for its medieval harbour, colourful houses and several sandy bays backed by cliffs. Sea temperatures around Tenby follow the typical pattern of the British coast, cooling through the winter and peaking in late summer. Winter (December–February) water temperatures commonly sit between about 7 °C and 9 °C, rising through spring to roughly 8 °C–12 °C. In summer (June–August) the water usually warms to around 15 °C–18 °C on average, with occasional warmer spells pushing slightly higher. Autumn sees a gradual cooling, with September to November commonly between 12 °C and 15 °C. Local temperatures vary with weather, tides and sheltered versus exposed locations, so daily conditions can differ from monthly averages.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 7°C | 9°C | 11°C |
| February | 7°C | 8°C | 10°C |
| March | 7°C | 8°C | 10°C |
| April | 8°C | 10°C | 12°C |
| May | 9°C | 11°C | 13°C |
| June | 11°C | 14°C | 17°C |
| July | 13°C | 16°C | 19°C |
| August | 15°C | 17°C | 19°C |
| September | 15°C | 17°C | 19°C |
| October | 13°C | 15°C | 17°C |
| November | 11°C | 13°C | 16°C |
| December | 9°C | 11°C | 13°C |
* Click on a month to view detailed water temperature data.
Tenby: Weather Forecast
July 27
July 28
July 29
Location, Beaches & Local Information
Nearby Beaches & Facilities
Tenby North Beach
Penally Beach
Waterwynch Bay Beach
Tenby South Beach
Tenby Castle Beach
Waterwynch Bay
Monkstone Beach
Priory Bay Beach
Bullum's Bay
Swimming Conditions
Swimming around Tenby suits a range of visitors, from families paddling in shallow, sandy bays to more experienced open-water swimmers. The town’s main beaches—South Beach, North Beach and Castle Beach—offer gentle slopes and, in summer, lifeguard cover on popular stretches, making them attractive for beach holidays. Cooler water even in summer means casual swimmers may find brief dips refreshing, while longer swims or sea-based activities such as kayaking and snorkelling are often more comfortable with a wetsuit. Rock pools and calmer harbour areas provide sheltered spots for less confident swimmers, but visitors should always check local advice about tides and currents and use marked swimming zones when lifeguards are on duty. Overall, Tenby combines classic seaside amenities with straightforward access to coastal swimming opportunities.