Gelliswick — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Gelliswick (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 Gelliswick help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Gelliswick in the Celtic Sea today is 53°F.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit can be used.
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 Gelliswick has risen over the last week and month. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Gelliswick will be 53°F 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 |
|---|---|---|---|
| MAY 8 | 53°F | 52°F | |
| MAY 9 | 53°F | 51°F | |
| MAY 10 | 53°F | 51°F | |
| MAY 11 | 53°F | 51°F | |
| MAY 12 | 54°F | 51°F | |
| MAY 13 | 53°F | 52°F | |
| MAY 14 | 53°F | 53°F | |
| MAY 15 | 53°F | 52°F | |
| MAY 16 | 53°F | 52°F | 53°F |
| MAY 17 | 52°F | 53°F | |
| MAY 18 | 52°F | 53°F | |
| MAY 19 | 52°F | 53°F | |
| MAY 20 | 51°F | 53°F | |
| MAY 21 | 54°F | 53°F | |
| MAY 22 | 53°F | 53°F | |
| MAY 23 | 54°F | 53°F |
* 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
Gelliswick sits on the sheltered shores of Milford Haven in Pembrokeshire, Wales, where the sea is influenced by the relatively enclosed estuary and the broader Irish Sea. Surface water temperatures here are cool by southern European standards and show distinct seasonal variation. In the coldest months (December to February) seawater commonly hovers around 8–9°C, rising gradually in spring to about 9–12°C during March to May. Summer (June to August) brings the warmest conditions, with typical surface temperatures in the bay reaching roughly 14–18°C at their peak. During autumn (September to November) the water cools again to around 11–14°C. Local bays and inlets can warm slightly more on calm, sunny days, while open or windward stretches feel chillier; tidal flows and weather patterns also affect short‑term readings.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 46°F | 48°F | 52°F |
| February | 45°F | 47°F | 50°F |
| March | 45°F | 47°F | 50°F |
| April | 46°F | 49°F | 52°F |
| May | 48°F | 52°F | 55°F |
| June | 52°F | 56°F | 61°F |
| July | 55°F | 60°F | 64°F |
| August | 57°F | 61°F | 66°F |
| September | 57°F | 61°F | 64°F |
| October | 55°F | 59°F | 63°F |
| November | 52°F | 56°F | 61°F |
| December | 48°F | 52°F | 57°F |
* Click on a month to view detailed water temperature data.
Gelliswick: Weather Forecast
May 17
May 18
May 19
May 20
Location, Beaches & Local Information
Nearby Beaches & Facilities
Gelliswick Bay Beach
Conduit Beach
St. Thomas' Bay
Sleeping Bay
Sandy Haven Beach
St Ishmaels Beach
Lindsway Bay
West Angle Bay Beach
Jetty Beach
Swimming Conditions
Swimming and beach holidays at Gelliswick are best suited to those who expect temperate British waters and plan accordingly. The sheltered bay offers opportunities for bathing, casual snorkeling, paddle sports and family beach days when conditions are calm and temperatures are at their summer maximum. Outside the peak months many visitors choose wetsuits for longer swims or paddling to stay comfortable in water commonly below 15°C. Rock pools and shallow areas provide safer, warmer spots for children and less experienced swimmers, but tidal changes and occasional currents mean attention to local conditions is advisable. Overall, Gelliswick can be a pleasant coastal destination for active water users and beachgoers who appreciate cooler, clearer waters and the seasonal nature of swimming in this part of Wales.