Weather in September
September signifies the beginning of fall in Kotka, with a noticeable decline in daylight hours and falling sea temperatures. The sea temperatures drop to an average of 14.9°C (58.8°F), introducing cooler weather into the city. Despite the changes, September preserves a mild warmth, allowing for continuous engagement in outdoor activities. The shift in weather from August is indicative of the approaching winter months.
Note: In 14.9°C (58.8°F), cold shock and rapid breathing can occur when swimming at temperatures below 10°C (50°F).
On the first day of the month, sunrise is at 06:07 and sunset at 20:16. On the last day of September, sunrise is at 07:16 and sunset at 18:47 EEST.
Sea temperature
In Kotka, the average seawater temperature in September is 14.9°C (58.8°F).Note: In 14.9°C (58.8°F), cold shock and rapid breathing can occur when swimming at temperatures below 10°C (50°F).
Daylight
In Kotka, Finland, the average length of the day in September is 12h and 53min.On the first day of the month, sunrise is at 06:07 and sunset at 20:16. On the last day of September, sunrise is at 07:16 and sunset at 18:47 EEST.
Updated: Jan 31, 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
What is the water temperature in September in Kotka?
In Kotka, Finland, in September, the average water temperature is 14.9°C (58.8°F). Swimming in 14.9°C (58.8°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.
How many hours of daylight does Kotka have in September?
In Kotka, the average day length in September is 12h and 53min.
When is the sunrise / sunset in September in Kotka?
In September, on the first day of the month, sunrise is at 06:07 and sunset at 20:16. On the last day of the month, in Kotka, Finland, sunrise is at 07:16 and sunset at 18:47 EEST.
Average sea temperature in September
Kotka, Finland
- Average sea temperature in September: 14.9°C
The best month for swimming (with the highest average sea temperature) is July (18.9°C).
The coldest months (with the lowest average sea temperature) are February and March (-0.2°C).
Average daylight in September
Kotka, 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).
Kotka, Finland
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