Qingdao enjoys a temperate, semi-humid climate. The best time for travelers is from June to
September, when the temperature stays between 20 and 28 degrees C.
In late August, in particular, the seawater is warm, the prime time for swimming and sunbathing on the coast (and participating in the Beer Festival, August 12-16).
Out of peak season, the city can get a little windy so bring a coat, although at such times the crowds will be much diminished and you get the chance to smile at the Y-fronted old men daring the brisk water!!
Qingdao Time and Weather