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Sea Temperature in Mariehamn in September
© Jussi S
Complete information on the sea temperature range in the Baltic Sea in Mariehamn in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Mariehamn. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Water Temperature Range in Mariehamn in September
11°C
MINIMUN
15°C
AVERAGE
19°C
MAXIMUM
Historical Data of Water Temperature in September in Mariehamn
Water Temperature Chart for Baltic Sea in Mariehamn in September
Sea Temperature Table in Mariehamn in September Over the Past Years
| Day | 2024 | 2023 | 2022 | Average |
|---|---|---|---|---|
| Sep 1 | 15°C | 17°C | 18°C | 16.3°C |
| Sep 2 | 15°C | 18°C | 17°C | 16.3°C |
| Sep 3 | 15°C | 17°C | 17°C | 16.0°C |
| Sep 4 | 14°C | 17°C | 16°C | 15.8°C |
| Sep 5 | 14°C | 17°C | 15°C | 15.5°C |
| Sep 6 | 14°C | 17°C | 15°C | 15.5°C |
| Sep 7 | 14°C | 17°C | 14°C | 15.3°C |
| Sep 8 | 14°C | 17°C | 14°C | 15.3°C |
| Sep 9 | 14°C | 17°C | 13°C | 15.0°C |
| Sep 10 | 13°C | 16°C | 12°C | 14.0°C |
| Sep 11 | 13°C | 15°C | 12°C | 13.8°C |
| Sep 12 | 13°C | 15°C | 11°C | 13.8°C |
| Sep 13 | 13°C | 15°C | 15°C | 14.8°C |
| Sep 14 | 13°C | 15°C | 15°C | 14.5°C |
| Sep 15 | 13°C | 15°C | 15°C | 14.5°C |
| Sep 16 | 13°C | 14°C | 14°C | 13.8°C |
| Sep 17 | 14°C | 14°C | 14°C | 14.3°C |
| Sep 18 | 13°C | 14°C | 14°C | 13.8°C |
| Sep 19 | 13°C | 14°C | 14°C | 14.0°C |
| Sep 20 | 13°C | 13°C | 13°C | 13.5°C |
| Sep 21 | 12°C | 13°C | 13°C | 13.3°C |
| Sep 22 | 12°C | 13°C | 13°C | 13.3°C |
| Sep 23 | 12°C | 13°C | 12°C | 13.0°C |
| Sep 24 | 12°C | 12°C | 12°C | 12.8°C |
| Sep 25 | 12°C | 12°C | 12°C | 12.5°C |
| Sep 26 | 12°C | 13°C | 11°C | 12.5°C |
| Sep 27 | 12°C | 13°C | 11°C | 12.5°C |
| Sep 28 | 13°C | 13°C | 11°C | 12.8°C |
| Sep 29 | 12°C | 13°C | 11°C | 12.5°C |
Mariehamn Climate and Swimming Opportunities in September
14°C
Average Day Air Temperature
7°C
Average Night Air Temperature
59 mm
Precipitation Amount per Month
11 days
Number of Rainy Days
13 hrs
Daylight
per Day
4 hrs
Sunshine
per Day
16 km/h
Average Wind Speed
83%
Average
humidity
Mariehamn lies within the Åland in Finland. The average daytime temperature in Mariehamn in September is 14°C (57°F), while the nighttime average is 7°C (45°F). There are typically 11 rainy days during the month, with a total precipitation of 59 mm (2.3 inches). The daylight duration in September in Mariehamn is 13 hours, with an average of 4 hours of sunshine per day. The average wind speed in September is 16 km/h (10 mph), and the humidity level is around 83%.
The water temperature in Mariehamn in September ranges from 12°C to 17°C (54°F to 63°F). At the beginning of the month, the average temperature is around 16°C (61°F), shifting to 14°C (57°F) by mid-September and reaching 13°C (55°F) in the last ten days. Overall, the average sea temperature in Mariehamn for September is 14°C (57°F). The water is cool, but many swimmers can tolerate it, especially with the sun out. Acclimatization is helpful.
Sea Temperature in September in Nearby Cities
Frequently Asked Questions About Water Temperatures in September in Mariehamn
What is the sea temperature in Mariehamn in September?
The water temperature in the Baltic Sea in Mariehamn in September ranges from 12°C to 17°C (54°F to 63°F).
Is it possible to swim in the Baltic Sea in Mariehamn in September?
The average sea temperature in Mariehamn in September is 14°C (57°F), and the air temperature is 14°C (57°F), so the water is cool, but many swimmers can tolerate it, especially with the sun out. Acclimatization is helpful.