Harwich
United Kingdom
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Harwich, United Kingdom

In Harwich, United Kingdom, the average seawater temperature in January is 7.8°C (46°F). Note: Swimming in 7.8°C (46°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 Harwich, United Kingdom, the average seawater temperature in February is 7.7°C (45.9°F). Note: Swimming in 7.7°C (45.9°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in February »

March is the month with the coldest seawater in Harwich, United Kingdom, with an average sea temperature of 7.2°C (45°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 March »

In April, the average sea temperature in Harwich, United Kingdom, is 9°C (48.2°F). Note: Swimming in 9°C (48.2°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 Harwich, United Kingdom, is 11.4°C (52.5°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 May »

In June, the average sea temperature in Harwich, United Kingdom, is 14.3°C (57.7°F). Note: Swimming in 14.3°C (57.7°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 June »

In Harwich, United Kingdom, in July, the average water temperature is 16°C (60.8°F). Note: Swimming in 16°C (60.8°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F). Weather in July »

In August, the average sea temperature in Harwich, United Kingdom, is 17.6°C (63.7°F). Note: For swimming, a surface water temperature of 17.6°C (63.7°F) is not enjoyable for the majority. Weather in August »

The month with the warmest seawater in Harwich, United Kingdom, is September, with an average sea temperature of 17.7°C (63.9°F). Note: Swimming in 17.7°C (63.9°F) is not enjoyable for the majority. Weather in September »

In October, the average sea temperature in Harwich, United Kingdom, is 16.1°C (61°F). Note: For swimming, a surface water temperature of 16.1°C (61°F) is not enjoyable for the majority. Weather in October »

In Harwich, United Kingdom, in November, the average water temperature is 13.9°C (57°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 Harwich, United Kingdom, in December, 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 December »

When is the sea coldest in Harwich?

March is the month with the coldest seawater, with an average sea temperature of 7.2°C (45°F).

When are the longest days in Harwich?

June has the longest days of the year in Harwich, with an average of 16.6h of daylight.

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

September is the month with the warmest seawater in Harwich, United Kingdom, with an average sea temperature of 17.7°C (63.9°F).

What is the month with the shortest days in Harwich?

The month with the shortest days in Harwich is December, with an average of 7.9h of daylight.
Average sea temperature - Harwich, United Kingdom

The best month for swimming (with the highest average sea temperature) is September (17.7°C).
The coldest month (with the lowest average sea temperature) is March (7.2°C).

Average daylight - Harwich, United Kingdom

The month with the longest days is June (Average daylight: 16.6h).
The month with shortest days is December (Average daylight: 7.9h).