Koper
Slovenia
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Koper, Slovenia

In Koper, Slovenia, in January, the average water temperature is 10.3°C (50.5°F). Note: Swimming in 10.3°C (50.5°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in January »

February is the month with the coldest seawater in Koper, Slovenia, with an average sea temperature of 9.3°C (48.7°F). Note: Swimming in 9.3°C (48.7°F) is considered dangerous. Weather in February »

In Koper, Slovenia, the average seawater temperature in March is 10.1°C (50.2°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 Koper, Slovenia, in April, the average water temperature is 13.1°C (55.6°F). Note: Swimming in 13.1°C (55.6°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 Koper, Slovenia, is 18°C (64.4°F). Note: Swimming in 18°C (64.4°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 May »

In June, the average sea temperature in Koper, Slovenia, is 22.8°C (73°F). Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. Weather in June »

Months with the warmest seawater in Koper, Slovenia, are July and August, with an average sea temperature of 24.8°C (76.6°F). Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24.8°C (76.6°F) water may be enjoyable. Weather in July »

Months with the warmest seawater in Koper, Slovenia, are July and August, with an average sea temperature of 24.8°C (76.6°F). Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.8°C (76.6°F) water. Weather in August »

In Koper, Slovenia, the average seawater temperature in September is 23.3°C (73.9°F). Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.3°C (73.9°F) water. Weather in September »

In October, the average sea temperature in Koper, Slovenia, is 19°C (66.2°F). Note: For most, swimming in 19°C (66.2°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F). Weather in October »

In Koper, Slovenia, in November, the average water temperature is 16.1°C (61°F). Note: Swimming in 16.1°C (61°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 November »

In Koper, Slovenia, in December, the average water temperature is 13.2°C (55.8°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 December »

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

With an average sea temperature of 9.3°C (48.7°F), February is the month with the coldest seawater in Koper, Slovenia.

When are the longest days in Koper?

With an average of 15.6h of daylight, June has the longest days of the year in Koper.

What months are the sea warmest in Koper?

July and August, with an average sea temperature of 24.8°C (76.6°F), are months with the warmest seawater in Koper, Slovenia.

What is the month with the shortest days in Koper?

December has the shortest days of the year, with an average of 8.8h of daylight.
Average sea temperature - Koper, Slovenia

The best months for swimming (with the highest average sea temperature) are July and August (24.8°C).
The coldest month (with the lowest average sea temperature) is February (9.3°C).

Average daylight - Koper, Slovenia

The month with the longest days is June (Average daylight: 15.6h).
The month with the shortest days is December (Average daylight: 8.8h).