Compared with Shanghai in summer, which is hotter in Guangzhou?

According to my 10 running experience, Guangzhou is generally hotter than Shanghai in July, August and September. The heat in Shanghai is different from that in Guangzhou. The temperature difference between day and night in Shanghai is large. Generally speaking, if you look at the weather forecast reported by Shanghai Oriental TV, the difference between the highest and lowest temperatures can be close to 10 degrees. At the same time, influenced by the maritime climate, Shanghai is cooler at night (especially in Baoshan District, jichang town in Pudong New Area, and the former Nanhui District, which has been merged into Pudong, and these places can be exempted from air conditioning in summer); The temperature difference between morning and evening in Guangzhou is small, it is hot during the day and not cold at night. Because the rainy season has passed, when it doesn't rain, the air is sultry, the sunshine is positive (Guangzhou is on the Tropic of Cancer, and summer is just the direct point of the sun), and the ground temperature can reach more than 50 degrees (the TV station said that the ground temperature in Guangzhou was 58. 1 degree the day before yesterday).

Secondly, Shanghai has a large urban area, which is not as obvious as Guangzhou's urban and suburban areas (for example, Lujiazui is in Pudong, the urban area is in Puxi, and even there are several centers in Puxi), which makes the heat island effect less obvious than Guangzhou. The real center of Guangzhou is the 63rd floor-Ouzhuang, tianhe sports center-CITIC Plaza, Jiangnan Avenue in Haizhu District and Beijing Road, which are relatively concentrated and crowded.