September weather forecast
Guangzhou, China

September sees a gradual decrease in temperatures, signifying a slow approach towards the end of the hot season. Though the drop in temperature is gradual, it fosters a noticeable change in the city's atmosphere. Rainfall decreases to 166mm (6.54"), providing some respite from the preceding wet months. Daylight hours begin to recede, hinting at the approaching winter solstice. As autumn peeks behind summer's curtain, the locals appreciate the subtle changes of their season's transition.

Temperature

In September, Guangzhou experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 32.7°C (90.9°F) in August to a still hot 31.5°C (88.7°F). In Guangzhou, the average nighttime temperature during September is a warm 24°C (75.2°F).

Heat index

The average heat index in September is computed to be an extremely hot 42°C (107.6°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

In September, the average relative humidity in Guangzhou is 78%.

Rainfall

In Guangzhou, in September, during 12.5 rainfall days, 166mm (6.54") of precipitation is typically accumulated. In Guangzhou, during the entire year, the rain falls for 149.2 days and collects up to 1736mm (68.35") of precipitation.

Daylight

In Guangzhou, the average length of the day in September is 12h and 17min.
On the first day of the month, sunrise is at 06:09 and sunset at 18:44. On the last day of September, in Guangzhou, China, sunrise is at 06:18 and sunset at 18:15 CST.

Sunshine

The average sunshine in September is 5.7h.

UV index

In September, the average daily maximum UV index is 11. A UV Index estimate of 11, and higher, represents an extreme health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 11 in September interprets into the following advice:
Adopt all essential precautions. Preventing sun harm is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Even under cloud cover, use sunscreen with at least an SPF 30 generously and reapply frequently post every swim or outdoor exercise.