Monthly weather forecast and climate
Hamina, Finland

Weather in January

In January, the average sea temperature in Hamina, Finland, is 0.1°C (32.2°F). Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Weather in January »

Weather in February

The month with the coldest seawater in Hamina, Finland, is February, with an average sea temperature of -0.5°C (31.1°F). Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Weather in February »

Weather in March

In March, the average sea temperature in Hamina, Finland, is -0.3°C (31.5°F). Note: For swimming, this is considered very dangerous and immediately life-threatening. Weather in March »

Weather in April

In April, the average sea temperature in Hamina, Finland, is 1.3°C (34.3°F). Note: For swimming, this is considered very dangerous and immediately life-threatening. Weather in April »

Weather in May

In Hamina, Finland, in May, the average water temperature is 6.8°C (44.2°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 May »

Weather in June

In Hamina, Finland, in June, the average water temperature is 13.6°C (56.5°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 June »

Weather in July

The month with the warmest seawater in Hamina, Finland, is July, with an average sea temperature of 19.3°C (66.7°F). Note: For most, swimming in 19.3°C (66.7°F) is not an enjoyable activity. Weather in July »

Weather in August

In Hamina, Finland, in August, the average water temperature 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 »

Weather in September

In September, the average sea temperature in Hamina, Finland, is 15.1°C (59.2°F). Note: For swimming, a surface water temperature of 15.1°C (59.2°F) is not enjoyable for the majority. Weather in September »

Weather in October

In October, the average sea temperature in Hamina, Finland, 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 October »

Weather in November

In Hamina, Finland, in November, the average water temperature is 6.3°C (43.3°F). Note: Swimming in 6.3°C (43.3°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in November »

Weather in December

In Hamina, Finland, in December, the average water temperature is 2.9°C (37.2°F). Note: For swimming, this is considered very dangerous and immediately life-threatening. Weather in December »
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FAQ

When is the sea coldest in Hamina?

February is the month with the coldest seawater in Hamina, Finland, with an average sea temperature of -0.5°C (31.1°F).

When are the longest days in Hamina?

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

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

July is the month with the warmest seawater, with an average sea temperature of 19.3°C (66.7°F).

What is the month with the shortest days in Hamina?

December has the shortest days of the year, with an average of 5.9h of daylight.

Average sea temperature
Hamina, Finland

Average sea temperature - Hamina, Finland

The best month for swimming (with the highest average sea temperature) is July (19.3°C).
The coldest month (with the lowest average sea temperature) is February (-0.5°C).

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Average daylight
Hamina, Finland

Average daylight - Hamina, 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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