Kotka
Finland
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Kotka, Finland

In January, the average sea temperature in Kotka, Finland, is 0.4°C (32.7°F). Note: For swimming, this is considered very dangerous and immediately life-threatening. Weather in January »
February and March, with an average sea temperature of -0.2°C (31.6°F), are months with the coldest seawater in Kotka, Finland. Note: For swimming, this is considered very dangerous and immediately life-threatening. Weather in February »

February and March, with an average sea temperature of -0.2°C (31.6°F), are months with the coldest seawater in Kotka, Finland. Note: For swimming, this is considered very dangerous and immediately life-threatening. Weather in March »

In April, the average sea temperature in Kotka, Finland, is 1.6°C (34.9°F). Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. Weather in April »

In Kotka, Finland, the average seawater temperature in May is 7.1°C (44.8°F). Note: Swimming in 7.1°C (44.8°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 »

In Kotka, Finland, the average seawater temperature in June is 13.5°C (56.3°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 June »

July is the month with the warmest seawater in Kotka, Finland, with an average sea temperature of 18.9°C (66°F). Note: For swimming, a surface water temperature of 18.9°C (66°F) is not enjoyable for the majority. Weather in July »

In August, the average sea temperature in Kotka, Finland, is 18.8°C (65.8°F). Note: For swimming, a surface water temperature of 18.8°C (65.8°F) is not enjoyable for the majority. Weather in August »

In Kotka, Finland, in September, the average water temperature is 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 September »

In Kotka, Finland, in October, the average water temperature is 10.2°C (50.4°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 October »

In November, the average sea temperature in Kotka, Finland, is 6.4°C (43.5°F). Note: Swimming in 6.4°C (43.5°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 November »

In December, the average sea temperature in Kotka, Finland, is 3.3°C (37.9°F). Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. Weather in December »

When is the sea coldest in Kotka?

February and March, with an average sea temperature of -0.2°C (31.6°F), are months with the coldest seawater in Kotka, Finland.

When are the longest days in Kotka?

The month with the longest days in Kotka is June, with an average of 18.9h of daylight.

When is the sea warmest in Kotka?

The month with the warmest seawater is July, with an average sea temperature of 18.9°C (66°F).

What is the month with the shortest days in Kotka?

With an average of 5.9h of daylight, December has the shortest days of the year.
Average sea temperature - Kotka, Finland

The best month for swimming (with the highest average sea temperature) is July (18.9°C).
Coldest months (with the lowest average sea temperature) are February and March (-0.2°C).

Average daylight - Kotka, Finland

The month with the longest days is June (Average daylight: 18.9h).
The month with shortest days is December (Average daylight: 5.9h).