Im currently in London and the weather is up and down! It was really nice all last week, like…15deg, then the weekend was miserable and rainy, then Monday/Tuesday was alright…still abit cloudy, but today was amazing…got to about 22deg which is rare for this time of the year!! I was walking around in a singlet and light jeans, but ive had under 10deg for the last 4 months, to go over 15deg is amazing and everyone is out sunbaking! haha.
It depends how much you feel the cold, i would say pack mostly shorts but maybe a pair of jeans for nighttime/incase its rainy cold…same with shirts…but i dont think youll need a heavy jacket! unneeded weight in your bag!! =]