Hanko
Finland
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Hanko, Finland

In Hanko, Finland, the average seawater temperature in January is 1.8°C (35.2°F). Note: For swimming, this is considered life-threatening and very dangerous. Weather in January »
In February, the average sea temperature in Hanko, Finland, is 0.4°C (32.7°F). Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. Weather in February »

The month with the coldest seawater in Hanko, Finland, is March, with an average sea temperature of 0.3°C (32.5°F). Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Weather in March »

In April, the average sea temperature in Hanko, Finland, is 1.7°C (35.1°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 Hanko, Finland, the average seawater temperature in May is 5.8°C (42.4°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 May »

In June, the average sea temperature in Hanko, Finland, is 12.3°C (54.1°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 »

In Hanko, Finland, the average seawater temperature in July is 16.9°C (62.4°F). Note: For swimming, a surface water temperature of 16.9°C (62.4°F) is not enjoyable for the majority. Weather in July »

August is the month with the warmest seawater in Hanko, Finland, with an average sea temperature of 17.8°C (64°F). Note: Swimming in 17.8°C (64°F) is not enjoyable for the majority. Weather in August »

In September, the average sea temperature in Hanko, 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 »

In October, the average sea temperature in Hanko, Finland, is 10.4°C (50.7°F). Note: Swimming in 10.4°C (50.7°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 October »

In Hanko, Finland, the average seawater temperature in November is 7.3°C (45.1°F). Note: Swimming in 7.3°C (45.1°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 Hanko, Finland, is 4.3°C (39.7°F). Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Weather in December »

When is the sea coldest in Hanko?

The month with the coldest seawater in Hanko is March, with an average sea temperature of 0.3°C (32.5°F).

When are the longest days in Hanko?

June has the longest days of the year in Hanko, with an average of 18.7h of daylight.

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

The month with the warmest seawater is August, with an average sea temperature of 17.8°C (64°F).

What is the month with the shortest days in Hanko?

The month with the shortest days is December, with an average of 6.1h of daylight.
Average sea temperature - Hanko, Finland

The best month for swimming (with the highest average sea temperature) is August (17.8°C).
The coldest month (with the lowest average sea temperature) is March (0.3°C).

Average daylight - Hanko, Finland

The month with the longest days is June (Average daylight: 18.7h).
The month with shortest days is December (Average daylight: 6.1h).