Weather in September
Sea temperature
In Uusikaupunki, Finland, the average seawater temperature in September is 10.3°C (50.5°F).Note: Diving into 10.3°C (50.5°F) is practical below 10°C (50°F), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 13°C (55.4°F) feels ice-cold.
Daylight
In Uusikaupunki, the average length of the day in September is 12h and 53min.On the first day of September, sunrise is at 06:28 and sunset at 20:39. On the last day of the month, sunrise is at 07:39 and sunset at 19:09 EEST.
Frequently asked questions
How cold is the water in September in Uusikaupunki?
In Uusikaupunki, Finland, in September, the average water temperature is 10.3°C (50.5°F). 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. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.
How many hours of daylight does Uusikaupunki have in September?
The average day length in September in Uusikaupunki, Finland, is 12h and 53min.
When is the sunrise / sunset in September in Uusikaupunki?
In September, on the first day of the month, sunrise is at 06:28 and sunset at 20:39. On the last day of the month, in Uusikaupunki, sunrise is at 07:39 and sunset at 19:09 EEST.
Average sea temperature in September
Uusikaupunki, Finland
- Average sea temperature in September: 10.3°C
The best month for swimming (with the highest average sea temperature) is August (13.1°C).
The coldest months (with the lowest average sea temperature) are February and March (-0.3°C).
Average daylight in September
Uusikaupunki, Finland
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 0min).
The month with the shortest days is December (Average daylight: 5h and 48min).
Uusikaupunki, Finland
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