Monthly weather forecast and climate
Portland, United Kingdom

In Portland, United Kingdom, the average seawater temperature in January is 9.7°C (49.5°F). Note: Swimming in 9.7°C (49.5°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in January »

In February, the average sea temperature in Portland, United Kingdom, 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 February »

With an average sea temperature of 8.8°C (47.8°F), March is the month with the coldest seawater in Portland, United Kingdom. Note: Swimming in 8.8°C (47.8°F) is considered life-threatening. Weather in March »

In April, the average sea temperature in Portland, United Kingdom, is 10°C (50°F). Note: Swimming in 10°C (50°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 April »

In May, the average sea temperature in Portland, United Kingdom, is 11.4°C (52.5°F). Note: Swimming in 11.4°C (52.5°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 Portland, United Kingdom, in June, the average water temperature is 13.3°C (55.9°F). Note: Swimming in 13.3°C (55.9°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 Portland, United Kingdom, the average seawater temperature in July is 15.3°C (59.5°F). Note: Swimming in 15.3°C (59.5°F) is not enjoyable for the majority. Weather in July »

In Portland, United Kingdom, in August, the average water temperature is 16.6°C (61.9°F). Note: Swimming in 16.6°C (61.9°F) is not enjoyable for the majority. Weather in August »

The month with the warmest seawater in Portland, United Kingdom, is September, with an average sea temperature of 17.1°C (62.8°F). Note: Swimming in 17.1°C (62.8°F) is not enjoyable for the majority. Weather in September »

In October, the average sea temperature in Portland, United Kingdom, is 16.2°C (61.2°F). Note: Swimming in 16.2°C (61.2°F) is not enjoyable for the majority. Weather in October »

In November, the average sea temperature in Portland, United Kingdom, is 14.3°C (57.7°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 »

In Portland, United Kingdom, the average seawater temperature in December is 11.9°C (53.4°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 December »

What is the month with the coldest sea water in Portland?

The month with the coldest seawater in Portland is March, with an average sea temperature of 8.8°C (47.8°F).

When are the longest days in Portland?

With an average of 16.4h of daylight, June has the longest days of the year in Portland, United Kingdom.

What is the month with the warmest sea water in Portland?

The month with the warmest seawater is September, with an average sea temperature of 17.1°C (62.8°F).

What is the month with the shortest days in Portland?

With an average of 8.1h of daylight, December has the shortest days of the year.
Average sea temperature - Portland, United Kingdom

The best month for swimming (with the highest average sea temperature) is September (17.1°C).
The coldest month (with the lowest average sea temperature) is March (8.8°C).

Average daylight - Portland, United Kingdom

The month with the longest days is June (Average daylight: 16.4h).
The month with the shortest days is December (Average daylight: 8.1h).