September weather forecastÖstermalm, Sweden
September
Weather in September
Sea temperature
In Östermalm, Sweden, the average seawater temperature in September is 14.9°C (58.8°F).Note: With the appropriate swimsuit, one can swim in 14.9°C (58.8°F) even if temperatures dip below 10°C (50°F); otherwise, be ready for cold shock and breath issues. A fleeting swim around 13°C (55.4°F) is distressing.
Daylight
The average length of the day in September in Östermalm, Sweden, is 12h and 50min.On the first day of the month, sunrise is at 05:45 and sunset at 19:49. On the last day of September, in Östermalm, sunrise is at 06:51 and sunset at 18:23 CEST.
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
In Östermalm, the average seawater temperature in September is 14.9°C (58.8°F). Swimming in 14.9°C (58.8°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.
The average day length in September is 12h and 50min.
In September, on the first day of the month, sunrise is at 05:45 and sunset at 19:49. On the last day of the month, in Östermalm, Sweden, sunrise is at 06:51 and sunset at 18:23 CEST.
Average sea temperature in September
Östermalm, Sweden
- Average sea temperature in September: 14.9°C
The best month for swimming (with the highest average sea temperature) is August (18.8°C).
The coldest month (with the lowest average sea temperature) is February (1°C).
Average daylight in September
Östermalm, Sweden
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 30min).
The month with the shortest days is December (Average daylight: 6h and 12min).
