Porthmadog
United Kingdom
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Porthmadog, United Kingdom

In January, the average sea temperature in Porthmadog, United Kingdom, 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 January »
February and March, with an average sea temperature of 8.3°C (46.9°F), are months with the coldest seawater in Porthmadog, United Kingdom. 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 February »

February and March, with an average sea temperature of 8.3°C (46.9°F), are months with the coldest seawater in Porthmadog, United Kingdom. Note: Swimming in 8.3°C (46.9°F) is considered life-threatening. Weather in March »

In Porthmadog, United Kingdom, the average seawater temperature in April is 9.2°C (48.6°F). Note: Swimming in 9.2°C (48.6°F) is considered life-threatening. Weather in April »

In Porthmadog, United Kingdom, in May, the average water temperature is 10.8°C (51.4°F). Note: Swimming in 10.8°C (51.4°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in May »

In Porthmadog, United Kingdom, 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 »

In July, the average sea temperature in Porthmadog, United Kingdom, is 14.6°C (58.3°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 July »

In August, the average sea temperature in Porthmadog, United Kingdom, is 15.5°C (59.9°F). Note: Swimming in 15.5°C (59.9°F) is not enjoyable for the majority. Weather in August »

With an average sea temperature of 15.7°C (60.3°F), September is the month with the warmest seawater in Porthmadog, United Kingdom. Note: For most, swimming in 15.7°C (60.3°F) is not an enjoyable activity. Weather in September »

In Porthmadog, United Kingdom, the average seawater temperature in October is 14.5°C (58.1°F). Note: Swimming in 14.5°C (58.1°F) is considered life-threatening. Weather in October »

In Porthmadog, United Kingdom, the average seawater temperature in November is 13.1°C (55.6°F). Note: Swimming in 13.1°C (55.6°F) is considered life-threatening. Weather in November »

In Porthmadog, United Kingdom, the average seawater temperature in December is 10.8°C (51.4°F). Note: Swimming in 10.8°C (51.4°F) is considered life-threatening. Weather in December »

What months are the sea coldest in Porthmadog?

February and March, with an average sea temperature of 8.3°C (46.9°F), are months with the coldest seawater.

When are the longest days in Porthmadog?

June has the longest days of the year in Porthmadog, with an average of 16.8h of daylight.

What month is the sea warmest in Porthmadog?

With an average sea temperature of 15.7°C (60.3°F), September is the month with the warmest seawater in Porthmadog, United Kingdom.

What is the month with the shortest days in Porthmadog?

With an average of 7.7h of daylight, December has the shortest days of the year in Porthmadog.
Average sea temperature - Porthmadog, United Kingdom

The best month for swimming (with the highest average sea temperature) is September (15.7°C).
Coldest months (with the lowest average sea temperature) are February and March (8.3°C).

Average daylight - Porthmadog, United Kingdom

The month with the longest days is June (Average daylight: 16.8h).
The month with shortest days is December (Average daylight: 7.7h).