We sailed 9/9 on the Millennium last year to many of those European ports. Other than Amsterdam where it was damp and rainy, and Paris it rained but was warm, The average temperature was in the high 70's and 80's with Sunshire and beautiful days. I recommend you bring some cotton pants or capri outfits and a few short outfits that you can mix or match. I brought a nylon lined jogging suit jacket and used it primarily in Amsterdam. Evenings were as usual.