September weather forecast and climate
Shanghai, China

The mother River Huangpu dividing the city into two in Shanghai, China
The mother River Huangpu dividing the city into two in Shanghai, China

Weather in September

September, the first month of the autumn, in Shanghai, is also a moderately hot month, with average temperature varying between 27.9°C (82.2°F) and 22.4°C (72.3°F).

Temperature

In Shanghai, the average high-temperature in September marginally drops, from a hot 31.5°C (88.7°F) in August, to a moderately hot 27.9°C (82.2°F). In September, the average low-temperature is 22.4°C (72.3°F).

Heat index

In September, the average heat index is calculated to be a hot 31.1°C (88°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, wind). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In September, the average relative humidity in Shanghai is 75%.

Rainfall

In Shanghai, in September, it is raining for 9.1 days, with typically 87.1mm (3.43") of accumulated precipitation. Throughout the year, there are 120.8 rainfall days, and 1166.1mm (45.91") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature in Shanghai is 25°C (77°F).
Note: 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.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

In Shanghai, the average sunshine in September is 5.6h.

UV index

In Shanghai, the average daily maximum UV index is 9. A UV Index reading of 8 to 10 represents a very high health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 9 transform into the following instructions:
Take special precautions, as unprotected skin can be damaged and can burn quickly. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in September in Shanghai?

The average high-temperature, in September, in Shanghai, China, is 27.9°C (82.2°F), while the average low-temperature is 22.4°C (72.3°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is calculated to be 31.1°C (88°F).

What is the average humidity in September in Shanghai?

The average relative humidity in September is 75%.

How many days does it rain in September in Shanghai?

In Shanghai, in September, during 9.1 rainfall days, 87.1mm (3.43") of precipitation is typically accumulated.

How warm is the water in September in Shanghai?

In Shanghai, in September, the average water temperature is 25°C (77°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in September in Shanghai?

In Shanghai, China, the average length of the day in September is 12.4h.

How many hours of sunshine does Shanghai have in September?

In September, the average sunshine in Shanghai is 5.6h.

What is the UV index intensity in September in Shanghai?

In September, the average daily maximum UV index in Shanghai is 9. A UV Index estimate of 8 to 10 represents a very high hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Shanghai, China

Average temperature in September - Shanghai, China
  • Average high temperature in September: 27.9°C

The warmest month (with the highest average high temperature) is July (32.2°C).
The month with the lowest average high temperature is January (8.1°C).

  • Average low temperature in September: 22.4°C

Months with the highest average low temperature are July and August (25.8°C).
The coldest month (with the lowest average low temperature) is January (2.1°C).

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Average humidity in September
Shanghai, China

Average humidity in September - Shanghai, China
  • Average humidity in September: 75%

The month with the highest relative humidity is June (79%).
The month with the lowest relative humidity is December (71%).

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Average rainfall in September
Shanghai, China

Average rainfall in September - Shanghai, China
  • Average rainfall in September: 87.1mm

The wettest month (with the highest rainfall) is August (213.7mm).
The driest month (with the least rainfall) is December (43.9mm).

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Average rainfall days in September
Shanghai, China

Average rainfall days in September - Shanghai, China
  • Average rainfall days in September: 9.1 days

The month with the highest number of rainy days is June (12.7 days).
The month with the least rainy days is October (6.9 days).

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Average sea temperature in September
Shanghai, China

Average sea temperature in September - Shanghai, China
  • Average sea temperature in September: 25°C

The best month for swimming (with the highest average sea temperature) is August (27°C).
The coldest months (with the lowest average sea temperature) are February and March (8°C).

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

Average daylight in September / Average sunshine in September - Shanghai, China
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.2h).
The month with the shortest days is December (Average daylight: 10.1h).

  • Average sunshine in September: 5.6h

The month with the most sunshine is July (Average sunshine: 6.2h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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Average UV index in September
Shanghai, China

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

Months with the highest UV index are June, July and August (UV index 11).
The month with the lowest UV index is December (UV index 3).

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