Monthly weather forecast and climate
Portrane, Ireland

Weather in January

In Portrane, Ireland, in January, the average water temperature 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 »

Weather in February

In Portrane, Ireland, in February, the average water temperature is 8.8°C (47.8°F). Note: Swimming in 8.8°C (47.8°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in February »

Weather in March

March is the month with the coldest seawater in Portrane, Ireland, with an average sea temperature of 8.4°C (47.1°F). Note: Swimming in 8.4°C (47.1°F) is considered life-threatening. Weather in March »

Weather in April

In Portrane, Ireland, the average seawater temperature in April is 9.2°C (48.6°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 April »

Weather in May

In Portrane, Ireland, the average seawater temperature in May 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 »

Weather in June

In June, the average sea temperature in Portrane, Ireland, is 12.3°C (54.1°F). Note: Swimming in 12.3°C (54.1°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in June »

Weather in July

In July, the average sea temperature in Portrane, Ireland, 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 »

Weather in August

The month with the warmest seawater in Portrane, Ireland, is August, with an average sea temperature of 14.9°C (58.8°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 August »

Weather in September

In September, the average sea temperature in Portrane, Ireland, is 14.8°C (58.6°F). Note: Swimming in 14.8°C (58.6°F) is considered life-threatening. Weather in September »

Weather in October

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

Weather in November

In Portrane, Ireland, in November, the average water temperature is 13.1°C (55.6°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 November »

Weather in December

In December, the average sea temperature in Portrane, 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 »
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FAQ

What month is the sea coldest in Portrane?

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

When are the longest days in Portrane?

The month with the longest days in Portrane, Ireland, is June, with an average of 16.9h of daylight.

When is the sea warmest in Portrane?

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

What is the month with the shortest days in Portrane?

With an average of 7.6h of daylight, December has the shortest days of the year in Portrane.

Average sea temperature
Portrane, Ireland

Average sea temperature - Portrane, 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).

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Average daylight
Portrane, Ireland

Average daylight - Portrane, Ireland

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

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