Monthly weather forecast and climate
Kotka, Finland

Weather in January

In Kotka, Finland, in January, the average water temperature is 0.4°C (32.7°F). Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Weather in January »

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 life-threatening and very dangerous. Weather in February »

Weather in March

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 life-threatening and very dangerous. Weather in March »

Weather in April

In Kotka, Finland, the average seawater temperature in April is 1.6°C (34.9°F). Note: For swimming, this is considered life-threatening and very dangerous. Weather in April »

Weather in May

In Kotka, Finland, the average seawater temperature in May is 7.1°C (44.8°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 May »

Weather in June

In June, the average sea temperature in Kotka, Finland, is 13.5°C (56.3°F). Note: Swimming in 13.5°C (56.3°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 »

Weather in July

The month with the warmest seawater in Kotka, Finland, is July, 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 »

Weather in August

In August, the average sea temperature in Kotka, Finland, is 18.8°C (65.8°F). Note: Swimming in 18.8°C (65.8°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 August »

Weather in September

In September, the average sea temperature in Kotka, Finland, 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 »

Weather in October

In Kotka, Finland, the average seawater temperature in October is 10.2°C (50.4°F). Note: Swimming in 10.2°C (50.4°F) is considered life-threatening. Weather in October »

Weather in November

In Kotka, Finland, the average seawater temperature in November is 6.4°C (43.5°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 November »

Weather in December

In Kotka, Finland, in December, the average water temperature is 3.3°C (37.9°F). Note: For swimming, this is considered life-threatening and very dangerous. Weather in December »
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FAQ

What months are the sea coldest in Kotka?

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

When are the longest days in Kotka?

With an average of 18.9h of daylight, June has the longest days of the year.

When is the sea warmest in Kotka?

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

What is the month with the shortest days in Kotka?

The month with the shortest days in Kotka, Finland, is December, with an average of 5.9h of daylight.

Average sea temperature
Kotka, Finland

Average sea temperature - Kotka, Finland

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

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Average daylight
Kotka, Finland

Average daylight - Kotka, Finland

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

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