Climate and monthly weather forecast
Weather in January
In January, the average sea temperature in Rosslare, Ireland, is 9.6°C (49.3°F). Note: Without suitable protection, venturing into 9.6°C (49.3°F) waters cooler than 10°C (50°F) can lead to pronounced cold shock and rapid breaths. Weather in January »
Weather in February
In February, the average sea temperature in Rosslare, Ireland, is 8.8°C (47.8°F). Note: With the appropriate swimsuit, one can swim in 8.8°C (47.8°F) even if temperatures dip below 10°C (50°F); otherwise, be ready for cold shock and breath issues. Weather in February »
Weather in March
March is the month with the coldest seawater in Rosslare, Ireland, with an average sea temperature of 8.4°C (47.1°F). Note: Swimming in 8.4°C (47.1°F) is deemed hazardous. Weather in March »
Weather in April
In Rosslare, Ireland, the average seawater temperature in April is 9.3°C (48.7°F). Note: Navigating the 9.3°C (48.7°F) at 13°C (55.4°F) is no joy, and temperatures less than 10°C (50°F) can threaten breathing and cause a chilling shock, gauging personal stamina. Weather in April »
Weather in May
In Rosslare, Ireland, the average seawater temperature in May is 10.8°C (51.4°F). Note: Dipping into 10.8°C (51.4°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Weather in May »
Weather in June
In Rosslare, Ireland, in June, the average water temperature is 12.8°C (55°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in June »
Weather in July
In July, the average sea temperature in Rosslare, Ireland, is 14.7°C (58.5°F). Note: Swimming in 14.7°C (58.5°F) is deemed hazardous. Exposure to temperatures below 10°C (50°F) leads to immediate severe cold shock and hyperventilation. Weather in July »
Weather in August
With an average sea temperature of 15.4°C (59.7°F), August is the month with the warmest seawater in Rosslare, Ireland. Note: Most people find swimming in 15.4°C (59.7°F) unenjoyable. Weather in August »
Weather in September
In September, the average sea temperature in Rosslare, Ireland, is 15.3°C (59.5°F). Note: Most people do not take pleasure in swimming in water at 15.3°C (59.5°F). Weather in September »
Weather in October
In Rosslare, Ireland, in October, the average water temperature is 14.4°C (57.9°F). Note: Dipping in 14.4°C (57.9°F) at temperatures less than 10°C (50°F) without proper gear can lead to pronounced cold shock and breathing difficulties. Weather in October »
Weather in November
In Rosslare, Ireland, in November, the average water temperature is 13.3°C (55.9°F). Note: Diving into 13.3°C (55.9°F) is practical below 10°C (50°F), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Weather in November »
Weather in December
In Rosslare, Ireland, the average seawater temperature in December is 11.5°C (52.7°F). Note: Danger awaits those who swim in 11.5°C (52.7°F) without protection. Weather in December »
Updated: Jan 27, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
When is the sea coldest in Rosslare?
With an average sea temperature of 8.4°C (47.1°F), March is the month with the coldest seawater in Rosslare, Ireland.
When are the longest days in Rosslare?
With an average of 16h and 42min of daylight, June has the longest days of the year in Rosslare.
What is the month with the warmest sea water in Rosslare?
August is the month with the warmest seawater in Rosslare, with an average sea temperature of 15.4°C (59.7°F).
When is Daylight Saving Time (DST) in Rosslare?
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from IST to GMT. Daylight Saving Time ends on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to IST.
What is the month with the shortest days in Rosslare?
The month with the shortest days in Rosslare is December, with an average of 7h and 48min of daylight.
Average sea temperature
Rosslare, Ireland
The best month for swimming (with the highest average sea temperature) is August (15.4°C).
The coldest month (with the lowest average sea temperature) is March (8.4°C).
Average daylight
Rosslare, Ireland
- Average daylight in January:
8h and 2min - Average daylight in February:
9h and 5min - Average daylight in March:
11h and 5min - Average daylight in April:
14h and 0min - Average daylight in May:
15h and 4min - Average daylight in June:
16h and 4min
- Average daylight in July:
16h and 1min - Average daylight in August:
14h and 4min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
8h and 5min - Average daylight in December:
7h and 5min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
