You'll be traveling in summer so it will be hot. You can have a look at daily averages here: http://weather.msn.com/daily_averages.aspx?wealocations=wc:CHXX0008&q=Beijing%2c+CHN+forecast:averagesd&weai=5
From Beijing to Dalian you can fly or get an overnight train - the Z sleeper train take 10 & 1/2 hours.
From Dalian to Qingdao you are best to fly as it is quicker. There is no direct train so if you don't want to fly it means taking a fast boat (about 3 to 4 hours) to Yantai and then a short bus ride from Yantai to Qingdao.
Check online for average temperatures but it will be nice and warm, a good time to visit. You can visit all 3 places in 12 days in a relaxed manner. For internal flights check www.travelzen.com but do not book early.
Adrian, It looks to me like you are taking the Diamond Princess repositioning Cruise or part of it.
We did the full Anchorage to Bangkok itenerary last Fall and had a great time.
I blogged my impression of this wonderful cruise and each of its destinations on my website wondricus.com - look for the three World Trip pages.
It may help you cultivate your anticipation of a wonderful experience.
IOf you are not on he cruise, it should be a fun and perhaps useful read for you.
Sorrym missed the 12 day criteria. We had friends who wanted to meet us. They planned to take the train.
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