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Portmarnock
Water Temperature in the Irish Sea in Portmarnock, Ireland: Current, Historical Data and Forecast
On this page, you will find comprehensive information about the sea temperature in Portmarnock in Ireland, including current readings, historical data and trends, monthly averages, as well as weather forecasts and upcoming temperature predictions. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Current Water Temperature in Portmarnock
7.2°C
TODAY
7.1°C
YESTERDAY
7.0°C
A WEEK AGO
Analysis, Historical Data, and Forecast of Water Temperature
Today sea water temperature in the Irish Sea in Portmarnock is 7.2°C. This water temperature is still quite low, and swimming in such conditions may only be comfortable for hardened individuals. It is recommended to limit the time spent in the water to avoid hypothermia. For those not accustomed to cold water, it is better to refrain from swimming. However, if you decide to enter the water, it is advisable to wear a warm wetsuit for protection against the cold.
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 for Irish Sea in Portmarnock Over the Last 30 Days
The water temperature in Portmarnock today is lower than both a week ago and a month ago. Today's sea temperature is generally in line with historical values for this day.
According to our forecast, the sea temperature in Portmarnock will remain nearly unchanged in the coming days, its value will be 7.7°C.
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 across Ireland to enhance accuracy.
Water temperature data for Portmarnock and nearby towns and resorts 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.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| Mar 4 | 7.0°C | 8.3°C | |
| Mar 5 | 6.8°C | 7.8°C | |
| Mar 6 | 7.0°C | 8.0°C | |
| Mar 7 | 6.9°C | 7.8°C | |
| Mar 8 | 7.2°C | 8.0°C | |
| Mar 9 | 6.9°C | 7.8°C | |
| Mar 10 | 7.1°C | 7.5°C | |
| Mar 11 | 7.2°C | 7.5°C | |
| Mar 12 | 8.0°C | 7.3°C | |
| Mar 13 | 7.8°C | 7.4°C | |
| Mar 14 | 7.8°C | 7.4°C | |
| Mar 15 | 8.3°C | 7.5°C | |
| Mar 16 | 7.8°C | 7.5°C | |
| Mar 17 | 8.0°C | 7.6°C | |
| Mar 18 | 8.0°C | 7.6°C | |
| Mar 19 | 8.3°C | 7.7°C |
Sea Temperature in Portmarnock Throughout the Year
Throughout the year, the sea temperature in Portmarnock never exceeds 64°F (18°C).
Below is the annual chart of sea temperature changes in the Irish Sea in Portmarnock.
January
| Minimum | Average | Maximum |
|---|---|---|
| 7°C | 9°C | 11°C |
February
| Minimum | Average | Maximum |
|---|---|---|
| 7°C | 8.5°C | 10°C |
March
| Minimum | Average | Maximum |
|---|---|---|
| 6°C | 8°C | 10°C |
April
| Minimum | Average | Maximum |
|---|---|---|
| 7°C | 9°C | 11°C |
May
| Minimum | Average | Maximum |
|---|---|---|
| 8°C | 10.5°C | 13°C |
June
| Minimum | Average | Maximum |
|---|---|---|
| 11°C | 13.5°C | 16°C |
July
| Minimum | Average | Maximum |
|---|---|---|
| 12°C | 15°C | 18°C |
August
| Minimum | Average | Maximum |
|---|---|---|
| 13°C | 15.5°C | 18°C |
September
| Minimum | Average | Maximum |
|---|---|---|
| 13°C | 15°C | 17°C |
October
| Minimum | Average | Maximum |
|---|---|---|
| 12°C | 14°C | 16°C |
November
| Minimum | Average | Maximum |
|---|---|---|
| 11°C | 12.5°C | 14°C |
December
| Minimum | Average | Maximum |
|---|---|---|
| 8°C | 10.5°C | 13°C |
Monthly Water Temperature Histogram for Irish Sea in Portmarnock
You can explore detailed data on how the water temperature in Portmarnock varies each month:
What Beaches Are There In and Around Portmarnock?
Portmarnock Beach
Portmarnock Beach is a 5-stars sandy beach, is located directly in Portmarnock. It has been awarded the prestigious Blue Flag, ensuring high environmental and quality standards. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Beach Car Park
Beach Car Park is a 1-stars sandy beach, is located directly in Portmarnock.
Velvet Strand
Velvet Strand is a 2-stars sandy beach, is located directly in Portmarnock. It has been awarded the prestigious Blue Flag, ensuring high environmental and quality standards.
Portmarnock
Portmarnock is a 5-stars sandy beach, is located directly in Portmarnock. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Portmarnock is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Bettystown
Bettystown is a 5-stars sandy beach, located in a 2 km (1 miles) radius of Portmarnock. There is parking. There are restrooms. There are cafés. Bettystown is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. Snorkeling is possible. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Malahide Beach
Malahide Beach is a 5-stars sandy beach, located in a 3 km (2 miles) radius of Portmarnock. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Corballis Bay Beach
Corballis Bay Beach is a 1-stars sandy beach, located in a 3 km (2 miles) radius of Portmarnock. For those who prefer clothing-optional beaches, Corballis Bay Beach is a designated nudist beach.
Burrow Beach
Burrow Beach is a 1-stars sandy beach, located in a 4 km (2 miles) radius of Portmarnock.
Balcarrick Beach
Balcarrick Beach is a 3-stars sandy beach, located in a 4 km (2 miles) radius of Portmarnock. There is parking. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Donabate Beach
Donabate Beach is a 5-stars sandy beach, located in a 5 km (3 miles) radius of Portmarnock. It has been awarded the prestigious Blue Flag, ensuring high environmental and quality standards. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Sutton Strand
Sutton Strand is a 1-stars sandy beach, located in a 5 km (3 miles) radius of Portmarnock.
Clogherhead
Clogherhead is a 5-stars sandy beach, located in a 5 km (3 miles) radius of Portmarnock. It has been awarded the prestigious Blue Flag, ensuring high environmental and quality standards. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Clogherhead is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Sutton North Bay Beach
Sutton North Bay Beach is a 1-stars sandy beach, located in a 6 km (4 miles) radius of Portmarnock.
Balscadden Bay Beach
Balscadden Bay Beach is a 1-stars sandy beach, located in a 6 km (4 miles) radius of Portmarnock.
The Burrow Beach
The Burrow Beach is a 5-stars sandy beach, located in a 6 km (4 miles) radius of Portmarnock. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Claremont Beach
Claremont Beach is a 1-stars sandy beach, located in a 6 km (4 miles) radius of Portmarnock.
Curracloe
Curracloe is a 5-stars sandy beach, located in a 7 km (4 miles) radius of Portmarnock. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Curracloe is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. Snorkeling is possible. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Dollymount Strand Beach
Dollymount Strand Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Portmarnock. There are lifeguards on the beach. There is parking. There are restrooms. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Balcarrick
Balcarrick is a 5-stars sandy beach, located in a 7 km (4 miles) radius of Portmarnock. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Balcarrick is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Tower Bay Beach
Tower Bay Beach is a 3-stars sandy beach, located in a 7 km (4 miles) radius of Portmarnock. There is parking. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Portmarnock Weather
MARCH 12
2°C / 6°C
scattered clouds: 25-50%humidity: 75% | wind: 4 km/h
MARCH 13
3°C / 6°C
scattered clouds: 25-50%humidity: 73% | wind: 2 km/h
MARCH 14
3°C / 6°C
scattered clouds: 25-50%humidity: 70% | wind: 4 km/h
MARCH 15
5°C / 6°C
few clouds: 11-25%humidity: 74% | wind: 3 km/h
Sea Temperature in the Irish Sea in Portmarnock: General Trends and Swimming Opportunities
Leinster, located on the coast of Ireland, has a temperate maritime climate characterized by mild winters and moderate summers. The region experiences frequent rainfall throughout the year, accompanied by consistent and moderate sea breezes.
Portmarnock is located in Europe in the Northern Hemisphere at a latitude of 53 degrees, along the shores of the Irish Sea. Portmarnock lies within the Leinster in Ireland.
The average annual daytime air temperature in Portmarnock is 14°C (57°F), with the average nighttime temperature being 7°C (45°F). The highest average daily temperature occurs in July, reaching 19°C (67°F), while the lowest is in January at 9°C (48°F). As for nighttime temperatures, the minimum average temperature of 3°C (37°F) is recorded in January, and the maximum is in July, reaching 12°C (53°F).
According to historical data, Portmarnock experiences 175 rainy days per year, which accounts for 48 percent of all days in the year. On average, there are 15 rainy days each month. The wettest month is January, with 17 rainy days and 63 mm (2.5 inches) of precipitation, while the driest month is June, which typically has 12 rainy days and only 61 mm (2.4 inches) of precipitation.
The average annual water temperature in Irish Sea in Portmarnock is 12°C (54°F). In March, the water reaches its lowest point of the year at 6°C (43°F), while in July, it peaks at 18°C (64°F). In Portmarnock, the water temperature in the Irish Sea never consistently reaches a comfortable level for swimming in any month.
Geographical Location of Portmarnock
Nearby Cities
Frequently Asked Questions About Portmarnock and its Water Temperatures
What is the current sea temperature in Portmarnock?
The water temperature today in the Irish Sea in Portmarnock is 45°F (7.2°C).
In which months is the water temperature in Portmarnock comfortable for swimming?
It cannot be guaranteed that the water temperature in Portmarnock will be comfortable for swimming in any month of the year.
What is the water temperature in Portmarnock during the winter?
The water temperature in the Irish Sea in Portmarnock during the winter ranges from 7°C to 13°C (45°F to 55°F).
What is the water temperature in Portmarnock during the spring?
The water temperature in the Irish Sea in Portmarnock during the spring ranges from 6°C to 13°C (43°F to 55°F).
What is the water temperature in Portmarnock during the summer?
The water temperature in the Irish Sea in Portmarnock during the summer ranges from 11°C to 18°C (52°F to 64°F).
What is the water temperature in Portmarnock during the fall?
The water temperature in the Irish Sea in Portmarnock during the fall ranges from 11°C to 17°C (52°F to 63°F).
Is it possible to swim in the sea in Portmarnock at any time of the year?
In Portmarnock, the Irish Sea is quite cold, and swimming is almost impossible as the water temperature never reaches 21°C (70°F).
Is Portmarnock a popular tourist destination for beach vacations?
Portmarnock has a moderate level of popularity for beach vacations; while it does receive some visitors, it is not among the top seaside destinations, as other locations may offer more favorable conditions.
What sea temperatures can I expect in Portmarnock in the next month?
In April, the water temperature in the Irish Sea in Portmarnock will range between 45°F (7°C) and 52°F (11°C)