Kindly advise best period to visit Beijing, Shanghai, Shenzhen & Hong Kong.

1. Beijing: From the middle of May to the middle of June, and from Early September to Middle October are best periods to tour around. The climate won't be too hot or too cold.

2. Shanghai: You can go there from March to May. Early spring is an appreciate time for travelling and outing. And tourists can see the beautiful scenery of natural scenic areas. Or from the end of September to November is also a good choice. Cool climate will bring you a good mood.

3. SZ: Acutally, this city welcomes tourists all year around, especially for winter and early spring. There maybe have less rainy days during that period of time. In addition, SZ doens't have chilly cold winter. So don't worry.

4. Hong Kong: Tourists are suggested to avoid typhoon season (June to October). Otherwise, heavy rains will influence your sightseeing a lot. You can go there during the period of November to March next year.