Wuhan is located in Central China and is the capital of Hubei Province. Hubei translated literally means "lake north". Well, the lake part is very true.  About 2/3 of the province is a wetland of some kind, be it rice fields, lotus bogs or random lakes.  The Yangtze River snakes its easterly way through the southern half of the province bringing its own contributions to the water content of the area, while the Han River comes in from the northwest to meet it. Check this site for a map... http://www.cinaoggi.com/china-map/wuhan/ (pink is city area, blue is water). Or go to... http://www.discoveryangtze.com/Yangtzediscovery/photo/map_wuhan.jpg or http://www.discoveryangtze.com/Yangtzediscovery/photo/map_china.jpg 

You can presume from the water content of the area, that summer can be pretty hot. And humid. Yup. Your assumption is quite accurate.  Wuhan is one of the 3 or 4 "furnaces" of China. On an average summer day, your clothing will be soaked before you have walked 1/4 mile from your door. No, it isn't from the rain.  Then winter comes without warning. Combine low, but humid temperatures with a general lack of heating and you freeze.  Students say there are only two seasons in Wuhan - summer and winter.  I'm inclined to agree. 

If you check Lonely Planet, the population of Wuhan is listed as 7,940,000.  My guess is the population regularly fluctuates between 8 and 10 million, depending on the time of year and the influx of students or migrant workers.

The city is actually a conglomeration of 3 cities - Wuchang (south of the Yangtze), Hankou, and Hanyang (both north of the Yangtze, but divided by the Han River).  Wuchang, the "education district", is peppered with innumerable universities, vocational colleges, and various learning institutions. Hankou, the "business district", is home to most of the banks, business centers and shopping areas.  Hankou is also the location of the old foreign concession.  The buildings reflect the architectural styles of Russia, Britain, France, Germany, and Japan.  Although this section of town no longer functions as the foreign concession, the buildings remain, but have been modified to house anything from bookstores and clothing shops to nightclubs and movie theaters.

That leaves little ole' Hanyang. I live in Hanyang... well, actually the backside of it. Hanyang is considered the "development district". There really isn't much else.  Most of it was villages until about 5 years ago.  My university actually used to be a village. That's why the former residents of the area decided to steal most of the trees during the first year the school moved here. They had a bit of a grudge.

Concerning tourist attractions... Hankou has Zhongshan Park, the Foreign Concession, now converted to Jianghan Lu Walking Street and Binjiang Park; Hanyang has Tortoise Mountain, The Platform of the Lute (Please see Stuff to Know), and Chang Jiang Da Qiao (the Big Bridge, designed by a Russian architect); Wuchang has the Yellow Crane Tower, East Lake, Mu Mountain, and Wuhan University (famous for its springtime cherry blossoms).