Weather in September
September is synonymous with the onset of autumn in Naantali. An evident drop in sea temperature to 10.3°C (50.5°F) presents a cooler environment. As the period progresses the daylight becomes shorter. It's the time when the hues of red and gold start appearing, painting a poetic scenery. Though the temperatures start dropping, the weather remains pleasant enough to explore the natural beauty of the city.
Note: Dipping into 10.3°C (50.5°F) below 10°C (50°F) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 13°C (55.4°F) feels cold to the bone.
On the first day of September in Naantali, sunrise is at 06:27 and sunset at 20:36. On the last day of the month, sunrise is at 07:36 and sunset at 19:06 EEST.
[Resources]Sea temperature
In Naantali, in September, the average water temperature is 10.3°C (50.5°F).Note: Dipping into 10.3°C (50.5°F) below 10°C (50°F) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 13°C (55.4°F) feels cold to the bone.
Daylight
In September, the average length of the day in Naantali is 12h and 53min.On the first day of September in Naantali, sunrise is at 06:27 and sunset at 20:36. On the last day of the month, sunrise is at 07:36 and sunset at 19:06 EEST.
Frequently asked questions
What is the water temperature in September in Naantali?
In Naantali, in September, the average water temperature is 10.3°C (50.5°F). Swimming in 10.3°C (50.5°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.
How many hours of daylight does Naantali have in September?
In Naantali, the average day length in September is 12h and 53min.
When is the sunrise / sunset in September in Naantali?
In September, on the first day of the month, sunrise is at 06:27 and sunset at 20:36. On the last day of the month, in Naantali, sunrise is at 07:36 and sunset at 19:06 EEST.
Average sea temperature in September
Naantali, Finland
- Average sea temperature in September: 10.3°C
The best month for swimming (with the highest average sea temperature) is August (12.8°C).
The coldest month (with the lowest average sea temperature) is February (-0.4°C).
Average daylight in September
Naantali, Finland
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).
Naantali, Finland
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