Sorry to post again, but I got interrupted before I finished my post, lol. (Why is the dental hygienist early when you're busy posting vital information? lol!!)
"I believe everyone who travels needs a good lightweight rain jacket."
I SO agree with Lola's comment. The first time I went to Europe (RS tour) I wasn't sure I'd need a rain jacket for May in Italy but threw one in at the last minute. It was completely necessary in an absolute downpour in Florence. Umbrellas didn't do it. It was also blowing so as usual ponchos were useless. You don't want to miss valuable vacation time if there is rain so I generally sightsee thru it (unless there is lightning). I learned then the truth of Lola's statement. I swapped that one out for one that packed better and is lighter and I always take it with me. Every single time. I might not need it but I have it. I can count on one hand the times I've NOT needed it, so you might as well invest in something that will be good for travel.
I went with the Marmot Precip back then but later decided it is cut too slim to layer things under or to be able to zip up a small cross body bag if it is really raining so have moved to a different waterproof jacket. I've worn my current one so much I've had to reapply the waterproof stuff to it so this is probably the last season but I've gotten my money's worth out of it.
You may not have time to purchase one before you go but do keep it in mind when you get back. If you live where there is an REI or other nice outdoor store, go in an feel the fabric of a couple of different brands. For myself the older Marmot was too crinkly sounding if that makes sense. However fabrics improve every year so they are softer and nicer now.