September weather forecast
Hangzhou, China

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Weather in September

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.
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Frequently asked questions

How hot is it in Hangzhou in September?

Hangzhou in September has an average high-temperature of 28.2°C (82.8°F) and an average low-temperature of 20.9°C (69.6°F). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is appraised at 32°C (89.6°F).

What is the average humidity in September in Hangzhou?

In Hangzhou, the average relative humidity in September is 79%.

How many days does it rain in September in Hangzhou?

In Hangzhou, in September, during 11.7 rainfall days, 124mm (4.88") of precipitation is typically accumulated.

What is the sea water temperature in September in Hangzhou?

In Hangzhou, China, the average seawater temperature in September is 25.7°C (78.3°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Hangzhou have in September?

In Hangzhou, China, the average day length in September is 12h and 21min.

When are sunrise and sunset in September in Hangzhou?

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.

How many hours of sunshine does Hangzhou have in September?

The average sunshine duration in September is 4.8h.

How high is the UV index in September in Hangzhou?

In Hangzhou, the average daily maximum UV index in September is 9. A UV Index of 8 to 10 symbolizes a very high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Hangzhou, China

Average temperature in September - Hangzhou, China
  • Average high temperature in September: 28.2°C

The warmest month (with the highest average high temperature) is July (33.6°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in September: 20.9°C

The month with the highest average low temperature is July (25.2°C).
The coldest month (with the lowest average low temperature) is January (1.8°C).

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Average humidity in September
Hangzhou, China

Average humidity in September - Hangzhou, China
  • Average humidity in September: 79%

The month with the highest relative humidity is June (80%).
The month with the lowest relative humidity is December (73%).

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Average rainfall in September
Hangzhou, China

Average rainfall in September - Hangzhou, China
  • Average rainfall in September: 123.5mm

The wettest month (with the highest rainfall) is June (219.4mm).
The driest month (with the least rainfall) is December (48.9mm).

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Average rainfall days in September
Hangzhou, China

Average rainfall days in September - Hangzhou, China
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is December (8.5 days).

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Average sea temperature in September
Hangzhou, China

Average sea temperature in September - Hangzhou, China
  • Average sea temperature in September: 25.7°C

The best month for swimming (with the highest average sea temperature) is August (26.9°C).
The coldest month (with the lowest average sea temperature) is February (8.8°C).

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Average daylight in September /
Average sunshine in September
Hangzhou, China

Average daylight in September / Average sunshine in September - Hangzhou, China
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in September: 4h and 5min

The month with the most sunshine is July (Average sunshine: 6h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).

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Average UV index in September
Hangzhou, China

Average UV index in September - Hangzhou, China
  • Average UV index in September: 9

The months with the highest UV index are June, July and August (UV index 11).
The months with the lowest UV index are January and December (UV index 4).

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Hangzhou, China

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