✔ 最佳答案
Hi,
Actually, September 未開始凍. Average temperature is 16 degree but you will feel a bit colder when wind gets stronger. Hence suggest to wear 風衣 on the outside to keep warm.
http://www.bbc.co.uk/weather/ukweather/year_review/reviews/september2006_review.shtml
Usually, weather will get colder after BST change to GMT in October. Hence no need to wear Coretex yet.
Hope this helps.