Portrane — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Portrane (Republic of Ireland). 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 Portrane help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Portrane in the Irish Sea today is 14°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
Water temperature in Portrane rose over the last 30 days but fell over the last week. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Portrane will be 13.5°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 |
|---|---|---|---|
| JUN 5 | 14.0°C | 13.0°C | |
| JUN 6 | 13.9°C | 12.5°C | |
| JUN 7 | 13.8°C | 12.5°C | |
| JUN 8 | 13.8°C | 12.0°C | |
| JUN 9 | 13.7°C | 13.0°C | |
| JUN 10 | 13.6°C | 12.5°C | |
| JUN 11 | 13.5°C | 13.0°C | |
| JUN 12 | 13.5°C | 13.0°C | |
| JUN 13 | 13.6°C | 13.0°C | 13.6°C |
| JUN 14 | 12.5°C | 13.6°C | |
| JUN 15 | 12.8°C | 13.6°C | |
| JUN 16 | 12.5°C | 13.5°C | |
| JUN 17 | 12.8°C | 13.5°C | |
| JUN 18 | 12.8°C | 13.5°C | |
| JUN 19 | 13.3°C | 13.5°C | |
| JUN 20 | 13.5°C | 13.5°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
Portraine, on the eastern coast of Leinster in the Republic of Ireland, sits on the southern shore of the outer Dublin Bay area and faces the Irish Sea. The water here is temperate but generally cool year-round. Typical winter sea temperatures (December–February) range from about 6°C to 8°C, with the coldest months often near 6°C. Spring (March–May) sees a gradual rise, commonly between 8°C and 12°C. Summer months (June–August) bring the warmest conditions, usually from around 13°C to 17°C, with occasional warm spells pushing localized surface temperatures to about 18°C. In autumn (September–November) temperatures typically fall back into the 10°C to 13°C band. These seasonal ranges reflect the influence of the Irish Sea and local weather patterns, so daily values can vary with wind, tides and sunlight.
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 | 6°C | 8°C | 10°C |
| April | 7°C | 9°C | 11°C |
| May | 9°C | 11°C | 13°C |
| June | 11°C | 13°C | 16°C |
| July | 12°C | 14°C | 18°C |
| August | 13°C | 15°C | 18°C |
| September | 13°C | 15°C | 17°C |
| October | 12°C | 14°C | 16°C |
| November | 11°C | 12°C | 15°C |
| December | 8°C | 10°C | 13°C |
* Click on a month to view detailed water temperature data.
Portrane: Weather Forecast
June 14
June 15
June 16
Location, Beaches & Local Information
Nearby Beaches & Facilities
Portrane Beach
Curracloe
Tower Bay Beach
Donabate Beach
Balcarrick Beach
Balcarrick
Clogherhead
Corballis Bay Beach
St. Catherine's Bay Beach
Swimming Conditions
Swimming and beach holiday options in Portraine are shaped by those water temperatures and the coastal environment. Sandy stretches and sheltered bays offer places for paddling, shore swimming and rock-pool exploration, while deeper water and open sea areas appeal to experienced swimmers and sea-sports enthusiasts. Because the sea is cool outside the height of summer, many visitors use wetsuits for longer swims or water sports, and sea-swimming groups often operate year-round. Tidal flows, underwater features and changing weather mean swimmers should check local conditions and exercise caution; shore-based amenities and seasonal services vary, so planning and an awareness of safety advice will make a beach stay more comfortable and enjoyable.