Sea Temperature in Llanelli in September

© Dermot Tuohey

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

Llanelli Climate and Swimming Opportunities in September

Llanelli lies within the Wales in United Kingdom. The average daytime temperature in Llanelli in September is 17°C (63°F), while the nighttime average is 11°C (51°F). There are typically 14 rainy days during the month, with a total precipitation of 87 mm (3.4 inches). The daylight duration in September in Llanelli is 13 hours, with an average of 5 hours of sunshine per day. The average wind speed in September is 14 km/h (9 mph), and the humidity level is around 86%.

The water temperature in Llanelli in September ranges from 16°C to 17°C (61°F to 63°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 17°C (63°F) in the last ten days. Overall, the average sea temperature in Llanelli 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 Llanelli