Sea Temperature in St Mary's Island in September

© Thomas Cogley

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

St Mary's Island Climate and Swimming Opportunities in September

St Mary's Island lies within the England in United Kingdom. The average daytime temperature in St Mary's Island in September is 19°C (65°F), while the nighttime average is 11°C (52°F). There are typically 11 rainy days during the month, with a total precipitation of 51 mm (2.0 inches). The daylight duration in September in St Mary's Island is 13 hours, with an average of 5 hours of sunshine per day. The average wind speed in September is 15 km/h (9 mph), and the humidity level is around 84%.

The water temperature in St Mary's Island in September ranges from 15°C to 18°C (59°F to 64°F). At the beginning of the month, the average temperature is around 17°C (63°F), shifting to 17°C (63°F) by mid-September and reaching 18°C (64°F) in the last ten days. Overall, the average sea temperature in St Mary's Island for September is 17°C (63°F). Ideal conditions for a refreshing swim, though some may still find it a bit cool.

Frequently Asked Questions About Water Temperatures in September in St Mary's Island