September weather forecast
Shanghai, China

As summer turns into autumn, September sees a slight decrease in the temperature levels. Although having a high amount of rainfall at 87mm (3.43"), the sea temperature remains warm, making beach outings possible. The UV index begins to decrease, making it safer for tourists to explore the city. While the sun sets a little earlier, locals and visitors can still enjoy the vibrant nightlife that Shanghai offers. In general, September provides a comfortable weather for visitors to navigate the bustling cityscape of Shanghai.

Temperature

The arrival of September in Shanghai, China, suggests a slight decrease in the average high-temperature, moving from a hot 31.5°C (88.7°F) in August to a moderately hot 27.9°C (82.2°F). Shanghai experiences a nighttime temperature average of 22.4°C (72.3°F) during September.

Heat index

The heat index value during September is appraised at a tropical 31°C (87.8°F). Constant activity during exposure could result in a state of weariness and possibly heat cramps.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.

Humidity

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

Rainfall

In September, in Shanghai, China, the rain falls for 9.1 days. Throughout September, 87mm (3.43") of precipitation is accumulated. Throughout the year, in Shanghai, there are 120.8 rainfall days, and 1166mm (45.91") of precipitation is accumulated.

Sea temperature

In Shanghai, China, the average seawater temperature in September is 25°C (77°F).
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 25°C (77°F) to 29°C (84.2°F), without any unpleasant sensations for prolonged durations.

Daylight

In Shanghai, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 05:30 and sunset at 18:17. On the last day of September, in Shanghai, sunrise is at 05:47 and sunset at 17:40 CST.

Sunshine

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

UV index

The average daily maximum UV index in September is 9. A UV Index of 8 to 10 symbolizes a very high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, a daily maximum UV index of 9 leads to the following instructions:
Prioritize protection; rapid damage can occur to unprotected eyes and skin. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Attention! The combination of sand and water reflections enhances UV ray intensity.