Today's Weather on September 18: Heat in Guangzhou, Sunny Skies in Beijing

Guangzhou has the highest temperature of the four cities; Beijing will be sunny with a marked temperature range

Guangzhou will be sunny on the 18th, with a high of 34°C, a low of 27°C, a 10% probability of rain and relative humidity of 54%. The heat stress index (WBGT) will be classified as severe caution. The outdoor activity index is rated poor, and the clothing index recommends short sleeves.

Beijing will also be sunny on the same day, with a high of 29°C and a low of 20°C, resulting in a marked difference between daytime and nighttime temperatures. Relative humidity will be 43%, and the probability of rain will be 10%. The heat stress index (WBGT) will be classified as caution, and the outdoor activity index is rated average. The driving index for both Guangzhou and Beijing will be rated excellent that day.

The wind speed in Guangzhou will be about 1 meter per second, with a wind direction of 7 degrees; in Beijing, the wind speed will be about 2 meters per second, with a wind direction of 7 degrees.

Chengdu and Shanghai will be overcast, with a 40% probability of rain but zero forecast precipitation

Chengdu will be overcast on the 18th, with a high of 26°C, a low of 20°C, a 40% probability of rain, forecast precipitation of 0 millimeters and relative humidity of 65%. The outdoor activity index is rated good, the heat stress index (WBGT) will be classified as caution, and the driving index will be rated excellent.

Shanghai will also be overcast on the same day, with a high of 30°C, a low of 24°C, a 40% probability of rain, forecast precipitation of 0 millimeters and relative humidity of 54%. The outdoor activity index is rated slightly poor, the heat stress index (WBGT) will be classified as caution, and the driving index will be rated excellent. Although the probability of rain is 40%, carrying rain gear as a precaution is recommended depending on personal circumstances.

The wind speed in Chengdu will be about 1 meter per second, with a wind direction of 4 degrees; in Shanghai, the wind speed will be about 3 meters per second, with a wind direction of 2 degrees.

Beijing's air quality data by time period; short sleeves recommended in all four cities

Beijing's air quality on the 18th is as follows: moderate pollution at 6:00, light pollution at 9:00, light pollution at 12:00, good air quality at 15:00, light pollution at 18:00 and light pollution at 21:00.

The overall air quality in Chengdu, Guangzhou and Shanghai that day will be moderate pollution, moderate pollution and light pollution, respectively. The clothing index in all four cities recommends mainly short sleeves, with high temperatures ranging from 26°C to 34°C.

For the outdoor activity index, Beijing is rated average, Chengdu good, Guangzhou poor and Shanghai slightly poor. All four ratings are based on the weather conditions for the day.