A boy cools himself in fountain in east China's Shanghai Municipality, July 7, 2011. Shanghai meteorological authority issued an orange heat alert on Thursday, saying that the highest temperature of Shanghai reached 37 degrees Centigrade.[Photo/Xinhua]

The pavilion will be open to public for three months till October 9, from Tuesday to Sunday.

A sunshade large enough to keep 8,000 people out of direct sunlight has been erected at the waiting area outside the pavilion. Fans have been installed under the sunshade, said pavilion staff.

The staff also had prepared enough umbrellas for 2,000 people at the security check zone.

Shanghai is expected to have from 20 to 24 days with temperatures reaching above 35 degrees Celsius this year, according to the Shanghai Municipal Meteorological Bureau.

The exhibition of the China Pavilion, also known as the "Crown of the East," was first extended from December 1, 2010 to May 31, 2011, after it was closed when the Shanghai Expo ended in October last year.

Like the first exhibition extension, tickets for the pavilion are still priced at 20 yuan (about 3.1 U.S. dollars) for adults and 15 yuan for students, disabled people, military servicemen and senior citizens.

During the first extension of exhibitions, the pavilion received more than 5.7 million visitors. During the six-month Expo, it received more than 10 million visitors from home and abroad.