Baltic Cruise sea conditions

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<p>We will be taking a Baltic Sea Cruise in the last half of August starting in Copenhagen and then crossing over to Gdansk, Riga Tallinin, St Petersburg, Helsinki, and Stockholm with a few islands inbetween. &nbsp;The ship is a smaller cruise ship with 100 passengers. &nbsp;What sort of sea conditions can we expect that time of year? &nbsp;Rough and stormy or Calm or something inbetween. &nbsp;Has anyone had any experience with this? &nbsp; Thanks. &nbsp;Ann White</p>