Situated south of the Tropic of Cancer, Shenzhen has a sub-tropical, marine monsoon climate. The winter is warm, with some cool periods. The summer is long, but not extremely hot. The annual average temperature is 22.5℃. Although Shenzhen has much rain, more than 80 percent of the annual precipitation falls during the summer. Shenzhen is sunny and humid; the average annual relative humidity is 77 percent. The city is warm and sunny most of the time. The annual average wind speed is 2.6 meters per second. The prevailing wind is from the east. In the summer, Shenzhen has seas breezes during the day, and land breezes at night.

1. High Temperature

The temperature in August is relatively stable, with little variation during the day. The average temperature is 28.2℃, and the temperature during the day generally ranges between 25℃ and 32℃. Because of Shenzhen's marine environment, the temperature rarely exceeds 35℃. However, because humidity is high, and solar radiation is strong around noon on a hot and sunny day, the temperature can still be high after 14:00.

2. Precipitation and Humidity

August is the month with the most precipitation in Shenzhen, but the duration of each rainfall is short. Most rainfalls last about one to two hours. Therefore, heavy rains that might severely affect the competitions will not be frequent. Typhoon and rainstorm might occur. Rain is frequent in August, and high humidity is a result of the rain. The average humidity in August is 82 percent; the highest and the lowest have been 88 percent and 74 percent.

3. Weak Winds; Calm Winds

In general, August is a month with low wind speeds and frequent calm winds. The average wind speed is only 2.1 meters per second. The prevailing wind comes from the east and the southwest. The winds have a regular pattern of daily changes because of their circulation between the land and the sea. Winds become strong around noon and become weak at dusk. The wind speed is at its lowest between 19:00 and 24:00.

4. Visibility

August is a month of high visibility, with little haze and fog. Visibility averages 15.8 kilometers; with 21.1 kilometers at the most, and 10.1 kilometers at the least. Heavy haze, which results from the downdraft on the periphery of a typhoon, is less likely. Any heavy haze would generally be brief.