The weather in the Baltic is very similar to ours, it can be a little colder or indeed hotter most of the Baltics being on the same latitude as the North of England. Quite honestly weather of late seems to be pot luck anyway and last years European weather was off the charts so many times that records were of no real consequence. Take some warm clothing and rainwear and hope that you can strip it off like the Swedes do at every opportunity. We love Celebrity and put it above most other cruise lines of similar cost, they are just better than you expect. ... Neil.
My wife and I have cruised twice on the Century. Baltic in 2005 and Arctic Circle last year. Although it was launched in 1995, its a lovely ship and Michaels Club is a great place for a drink. We found the entertainment, food and lectures very good and have no hesitation in recommending the ship. Regarding the weather, Neil is right, it is very much pot luck these days. We have cruised the Baltic twice and with the exception of one night had great weather on both cruises. We are doing the Baltic again next year on HAL Eurodam.
We went may 07 weather was low 20s/mid70sf and higher still in st petersburg.Shorts and teeshirts in daytime light jumper and slacks evening.Hope you are as lucky with your choice of weeks.Bon voyage!