Dún Laoghaire
Ireland
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Dún Laoghaire, Ireland

In Dún Laoghaire, Ireland, the average seawater temperature in January is 9.6°C (49.3°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 January »
In Dún Laoghaire, Ireland, the average seawater temperature in February is 8.8°C (47.8°F). Note: Swimming in 8.8°C (47.8°F) is considered life-threatening. Weather in February »

With an average sea temperature of 8.4°C (47.1°F), March is the month with the coldest seawater in Dún Laoghaire, Ireland. 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 March »

In Dún Laoghaire, Ireland, the average seawater temperature in April is 9.2°C (48.6°F). Note: Swimming in 9.2°C (48.6°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in April »

In Dún Laoghaire, Ireland, in May, the average water temperature is 10.4°C (50.7°F). Note: Swimming in 10.4°C (50.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique. Weather in May »

In Dún Laoghaire, Ireland, in June, the average water temperature is 12.3°C (54.1°F). Note: Swimming in 12.3°C (54.1°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique. Weather in June »

In Dún Laoghaire, Ireland, the average seawater temperature in July is 14.1°C (57.4°F). Note: Swimming in 14.1°C (57.4°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique. Weather in July »

With an average sea temperature of 14.9°C (58.8°F), August is the month with the warmest seawater in Dún Laoghaire, Ireland. Note: Swimming in 14.9°C (58.8°F) is considered life-threatening. Weather in August »

In Dún Laoghaire, Ireland, the average seawater temperature in September is 14.8°C (58.6°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 September »

In Dún Laoghaire, Ireland, in October, the average water temperature is 14.1°C (57.4°F). Note: Swimming in 14.1°C (57.4°F) is considered life-threatening. Weather in October »

In Dún Laoghaire, Ireland, in November, the average water temperature is 13.1°C (55.6°F). Note: Swimming in 13.1°C (55.6°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in November »

In December, the average sea temperature in Dún Laoghaire, Ireland, is 11.3°C (52.3°F). Note: Swimming in 11.3°C (52.3°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in December »

When is the sea coldest in Dún Laoghaire?

The month with the coldest seawater is March, with an average sea temperature of 8.4°C (47.1°F).

When are the longest days in Dún Laoghaire?

June has the longest days of the year, with an average of 16.9h of daylight.

When is the sea warmest in Dún Laoghaire?

August is the month with the warmest seawater in Dún Laoghaire, Ireland, with an average sea temperature of 14.9°C (58.8°F).

What is the month with the shortest days in Dún Laoghaire?

December has the shortest days of the year, with an average of 7.6h of daylight.
Average sea temperature - Dún Laoghaire, Ireland

The best month for swimming (with the highest average sea temperature) is August (14.9°C).
The coldest month (with the lowest average sea temperature) is March (8.4°C).

Average daylight - Dún Laoghaire, Ireland

The month with the longest days is June (Average daylight: 16.9h).
The month with shortest days is December (Average daylight: 7.6h).