its cold in london in may..dont know where in the states ur from so dont know what ur used to but…it rains.. it can get really windy
but its warm inside museums etc
so layer
get a thin rain jacket with a hood and keep it in ur day pack all the time

in late may and early june last year i wore long sleeved tshirt and a sweater and even a quilted jacket with a scarf in the mornings
a felt hat came in handy when the wind picked up and i was on the open decker bus

scandinavian chicks were walking in singlet tops…so yeah …depends on if u feel the cold!!

paris was warmer in very early june…was down to a sleeveless top some days but still carried a light sweater
just layer it all and dont forget to check for ur bits and pieces as u leave each stop…i lost my favourite scarf in a pub
good travels to u!

It depends. It may be still cold, or you may just hit a warm spell. It may be a good idea to make up, like three lists: hot/warm/cold, and check the forecast just before you go. But in any case it’s a good idea to be ready for sudden changes.

I agree— LAYERING is key! I had a heavy jacket during my winter in London, but I rarely used it because you’re just in and out so frequently in the cities. Instead, layering with a thin waterproof layer on top is the best. Oh, and gloves/mittens. If you need some more layering/packing tips, try my blog: www.rentvillas.blogs…. Hope you have fun! – Suzanne