Weather in January
In Östhammar, Sweden, the average seawater temperature in January is 0.9°C (33.6°F). Note: In the sport of swimming, this scenario is extremely cold, treacherous, and fatal. Weather in January »
Weather in February
February is the month with the coldest seawater in Östhammar, Sweden, with an average sea temperature of 0.1°C (32.2°F). Note: In swimming, this scenario poses immediate life-threatening danger. Weather in February »
Weather in March
In March, the average sea temperature in Östhammar, Sweden, is 0.3°C (32.5°F). Note: In swimming situations, the extreme cold and danger can lead to fatality. Weather in March »
Weather in April
In Östhammar, Sweden, the average seawater temperature in April is 1.7°C (35.1°F). Note: During swimming activities, this situation is lethal and fraught with danger. Weather in April »
Weather in May
In Östhammar, Sweden, in May, the average water temperature is 5.8°C (42.4°F). Note: Immersing oneself in 5.8°C (42.4°F) at sub-10°C (14°F) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped. Weather in May »
Weather in June
In June, the average sea temperature in Östhammar, Sweden, is 12.3°C (54.1°F). Note: Dipping in 12.3°C (54.1°F) at temperatures less than 10°C (50°F) without proper gear can lead to pronounced cold shock and breathing difficulties. Weather in June »
Weather in July
In July, the average sea temperature in Östhammar, Sweden, is 17°C (62.6°F). Note: Swimming in 17°C (62.6°F) is not an enjoyable experience for most. Weather in July »
Weather in August
August is the month with the warmest seawater in Östhammar, Sweden, with an average sea temperature of 18.2°C (64.8°F). Note: Swimming is not a pleasant activity for most individuals in 18.2°C (64.8°F). Weather in August »
Weather in September
In September, the average sea temperature in Östhammar, Sweden, is 14°C (57.2°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 September »
Weather in October
In October, the average sea temperature in Östhammar, Sweden, is 8.9°C (48°F). Note: Entering waters of 8.9°C (48°F) is life-endangering. A mere moment in 13°C (55.4°F) waters feels piercing cold, and below 10°C (50°F) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience. Weather in October »
Weather in November
In Östhammar, Sweden, the average seawater temperature in November is 5.7°C (42.3°F). Note: Engaging in a swim in 5.7°C (42.3°F) can threaten life. Weather in November »
Weather in December
In December, the average sea temperature in Östhammar, Sweden, is 3°C (37.4°F). Note: In swimming, this scenario poses immediate life-threatening danger. Weather in December »
[Resources]Frequently asked questions
When is the sea coldest in Östhammar?
February is the month with the coldest seawater in Östhammar, Sweden, with an average sea temperature of 0.1°C (32.2°F).
When are the longest days in Östhammar?
With an average of 18h and 48min of daylight, June has the longest days of the year.
What is the month with the warmest sea water in Östhammar?
With an average sea temperature of 18.2°C (64.8°F), August is the month with the warmest seawater.
When is Daylight Saving Time (DST) in Östhammar?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
What is the month with the shortest days in Östhammar?
With an average of 6h and 0min of daylight, December has the shortest days of the year in Östhammar.
Average sea temperature
Östhammar, Sweden
The best month for swimming (with the highest average sea temperature) is August (18.2°C).
The coldest month (with the lowest average sea temperature) is February (0.1°C).
Average daylight
Östhammar, Sweden
- Average daylight in January:
6h and 5min - Average daylight in February:
9h and 1min - Average daylight in March:
11h and 5min - Average daylight in April:
14h and 4min - Average daylight in May:
17h and 2min - Average daylight in June:
18h and 5min
- Average daylight in July:
18h and 0min - Average daylight in August:
15h and 4min - Average daylight in September:
12h and 5min - Average daylight in October:
10h and 1min - Average daylight in November:
7h and 3min - Average daylight in December:
6h and 0min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).
Östhammar, Sweden
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