Sea Temperature in Kustavi in September

© Krisse Saarinen

Complete information on the sea temperature range in the Baltic Sea in Kustavi in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Kustavi. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Kustavi Climate and Swimming Opportunities in September

Kustavi lies within the Western Finland Province in Finland. The average daytime temperature in Kustavi 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 Kustavi 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 Kustavi 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 Kustavi 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.

Frequently Asked Questions About Water Temperatures in September in Kustavi