In
September,
Hangzhou embarks on a journey towards the crisp autumn. The temperature moderation, ranging between 20.9°C (69.6°F) to 28.2°C (82.8°F), is welcomed with open arms. Rainfall is quantified at 124mm (4.88"). A slight chill begins to permeate the air, especially during the late evenings. This marks a smooth transition from the sizzling summer and sets the stage for the fascinating hues of autumn.
Temperature
The onset of September in Hangzhou is marked by a minor decrease in temperature, transitioning from a tropical 32.8°C (91°F) in
August to a moderately hot 28.2°C (82.8°F). During September, Hangzhou sees a mean low-temperature of 20.9°C (69.6°F).
Heat index
In September, the average heat index is appraised at a hot 32°C (89.6°F). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', quantifies the warmth felt when relative humidity is considered. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Humidity
In Hangzhou, the average relative humidity in September is 79%.
Rainfall
In Hangzhou, during September, the rain falls for 11.7 days and regularly aggregates up to 124mm (4.88") of precipitation. Throughout the year, in Hangzhou, there are 147.4 rainfall days, and 1438mm (56.61") of precipitation is accumulated.
Sea temperature
In September, the average sea temperature is 25.7°C (78.3°F).
Note: Engaging in water activities, such as swimming or diving, in temperatures from 25°C (77°F) to 29°C (84.2°F) is very pleasurable for extended periods, without any discomfort.
Daylight
The average length of the day in September is 12h and 21min.
On the first day of September, sunrise is at 05:36 and sunset at 18:22. On the last day of the month, sunrise is at 05:52 and sunset at 17:46 CST.
Sunshine
In September, the average sunshine is 4.8h.
UV index
In September, the average daily maximum UV index in Hangzhou is 9. A UV Index reading of 8 to 10 represents a very high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 9 during September translates into the following directions:
Always take precautions; unprotected eyes and skin can be damaged rapidly. 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. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Regardless of the cloudiness of the day, a sunscreen with SPF 30 or more should be applied and reapplied generously, specifically after swimming or outdoor exercise. Caution! The Sun's UV rays become stronger due to reflections from water and sand.