WET, muggy weather is expected to continue this week, after thunderstorms delivered a deluge to parts of the city yesterday, causing traffic jams as drivers battled low visibility.
Flights were delayed in the city's airports because of the sudden thunderstorm.
Yellow alerts, the lowest level of alert, were issued for lightning and rainstorms from mid to late afternoon as meteorologists warned of precipitation of up to 20 millimeters per hour and gale-force winds. Rainfall in Jinshan District reached 71mm by 8pm, but was much weaker in downtown areas, as Xujiahui recorded 23.4mm.
Thunderstorms are expected to return this week as a rain belt affects the lower reaches of Yangtze River, and temperature are likely to remain below 30 degrees Celsius for the next three to five days.
Today is expected to be slightly cooler, with a high of around 29 degrees Celsius and a low of 25 degrees, the Shanghai Meteorological Bureau said. The high tomorrow and Wednesday is forecast to be 27, with a low of 24 tomorrow and a low of 23 on Wednesday.
Residents may still perceive the weather as warm and muggy because of high humidity.
Shanghai is still in the plum rain season, which is marked by weeks of rains and humidity. The season began on June 7 this year, 10 days earlier than usual. It usually lasts about 24 days. The season usually starts in mid-June and ends in early July in Shanghai. Chinese traditionally marked the season by the growth of plums.
The city hit 36.4 degrees Celsius last Monday, making it the hottest June 17 since records began 140 years ago.