absolutely not.  I’m not a summer traveler, but there should be no reason for anything heavy.  And you would be suprised how much heavier that jacket will make your backpack feel.  I actually spent a couple weeks traveling europe in the dead of winter without a heavy jacket, but it wasn’t on pourpose [] 

You do not need a heavy jacket.  However, you have the distinct possibility of running into rain and very cool evenings — 45 degrees F and rain is COLD if you’re not prepared for it.  Take something with long sleeves (sweatshirt is pretty bulky to pack) in addition to a lightweight, water repellent jacket.  If you hit a serious cold spell you can layer t-shirt, long sleeves and your jacket.

If you’re camping and bringing a sleeping bag, you definitely don’t. Otherwise, a sweatshirt & hat will be fine.

If you are camping, there may be some cold nights – so prepare for that in some way, a light sleeping bag is the best bet. I suggest not taking a heavy jacket – if you find you need something warmer once you are there, you can always buy something. I am ALWAYS cold – my tip is bring silk long underwear. It is surprisingly warm and very compact.

Thanks everyone! That’s pretty much what I figured… just wanted some opinions.  I will definitely not be bringing a heavy jacket!

Going to Iceland, Greenland, Channel Isles, Northern Scotland, Faroe Islands, then take a coat.  North of Hamburg, take a thick sweater or fleece just in case.  Sometimes summer does not come to Denmark and it is 60-65 degrees and rain 9/10 days.  It’s been warm so far.  Love climate change.