Climate and monthly weather forecast
Weather in January
In January, the average sea temperature in Nynäshamn, Sweden, is 1.8°C (35.2°F). Note: Within swimming, this is perceived as extraordinarily cold, dangerous, and potentially lethal. Weather in January »
Weather in February
With an average sea temperature of 1°C (33.8°F), February is the month with the coldest seawater in Nynäshamn, Sweden. Note: In connection with swimming, this state is severely cold, hazardous, and lethal. Weather in February »
Weather in March
In March, the average sea temperature in Nynäshamn, Sweden, is 1.2°C (34.2°F). Note: In the course of swimming, this situation is life-threatening and fraught with risk. Weather in March »
Weather in April
In Nynäshamn, Sweden, the average seawater temperature in April is 3.2°C (37.8°F). Note: Under swimming conditions, this represents an immediate threat to life. Weather in April »
Weather in May
In May, the average sea temperature in Nynäshamn, Sweden, is 7.8°C (46°F). Note: Danger awaits those who swim in 7.8°C (46°F) without protection. Falling below 10°C (50°F) means intense cold shock and hyperventilation. Weather in May »
Weather in June
In Nynäshamn, Sweden, the average seawater temperature in June is 14.1°C (57.4°F). Note: Danger awaits those who swim in 14.1°C (57.4°F) without protection. Weather in June »
Weather in July
In July, the average sea temperature in Nynäshamn, Sweden, is 18.1°C (64.6°F). Note: In water with a temperature of 18.1°C (64.6°F), swimming is not a joy for most people. Weather in July »
Weather in August
With an average sea temperature of 18.7°C (65.7°F), August is the month with the warmest seawater in Nynäshamn, Sweden. Note: For the majority of people, swimming in water at 18.7°C (65.7°F) is not enjoyable. Weather in August »
Weather in September
In Nynäshamn, Sweden, in September, the average water temperature is 14.8°C (58.6°F). Note: While a brief time in 14.8°C (58.6°F) at 13°C (55.4°F) is already bracing, plunging below 10°C (50°F) can severely affect breathing and introduce a cold shock, relying on your physical state. Weather in September »
Weather in October
In Nynäshamn, Sweden, in October, the average water temperature is 9.9°C (49.8°F). Note: One needs to be cautious in 9.9°C (49.8°F) waters. 13°C (55.4°F) is already forbidding, but sub-10°C (14°F) can seriously disrupt your breathing and lead to a frigid shock, considering one's well-being. Weather in October »
Weather in November
In Nynäshamn, Sweden, in November, the average water temperature is 7.1°C (44.8°F). Note: Navigating the 7.1°C (44.8°F) at 13°C (55.4°F) is no joy, and temperatures less than 10°C (50°F) can threaten breathing and cause a chilling shock, gauging personal stamina. Weather in November »
Weather in December
In December, the average sea temperature in Nynäshamn, Sweden, is 4.8°C (40.6°F). Note: In the water-based sport of swimming, this state is life-threatening and exceedingly dangerous. Weather in December »
Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
When is the sea coldest in Nynäshamn?
February is the month with the coldest seawater in Nynäshamn, Sweden, with an average sea temperature of 1°C (33.8°F).
When are the longest days in Nynäshamn?
June has the longest days of the year in Nynäshamn, with an average of 18h and 18min of daylight.
What is the month with the warmest sea water in Nynäshamn?
August is the month with the warmest seawater in Nynäshamn, with an average sea temperature of 18.7°C (65.7°F).
When is Daylight Saving Time (DST) in Nynäshamn?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends in Nynäshamn, Sweden, 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 Nynäshamn?
With an average of 6h and 24min of daylight, December has the shortest days of the year in Nynäshamn, Sweden.
Average sea temperature
Nynäshamn, Sweden
The best month for swimming (with the highest average sea temperature) is August (18.7°C).
The coldest month (with the lowest average sea temperature) is February (1°C).
Average daylight
Nynäshamn, Sweden
- Average daylight in January:
7h and 1min - Average daylight in February:
9h and 2min - Average daylight in March:
11h and 5min - Average daylight in April:
14h and 3min - Average daylight in May:
16h and 5min - Average daylight in June:
18h and 2min
- Average daylight in July:
17h and 4min - Average daylight in August:
15h and 2min - Average daylight in September:
12h and 5min - Average daylight in October:
10h and 1min - Average daylight in November:
7h and 5min - Average daylight in December:
6h and 2min
The month with the longest days is June (Average daylight: 18h and 18min).
The month with the shortest days is December (Average daylight: 6h and 24min).
