September weather forecastChangshu, China
September
Weather in September
September in Changshu, China begins the descent from summer's peak with temperatures that are more tolerable than the previous months. The city greets the early fall with a noticeable decrease in rainfall from August, marking the transition from the wet summer season. Despite these shifts, it also signals the increased possibility of typhoons, making it essential for visitors to stay updated on weather conditions. As the season develops, the number of sunlight hours starts to decrease simultaneously. However, this doesn't undermine the beauty of the city as leaves start to change colors under the still-warm sun.Temperature
As September arrives, Changshu's weather displays a minor decrease in high-temperatures, transitioning from August's tropical 31.8°C (89.2°F) to a moderately hot 27.1°C (80.8°F). During September, Changshu consistently records a temperature low averaging a pleasant 20°C (68°F).Heat index
September's average heat index is calculated to be a tropical 30°C (86°F). Prolonged exposure and physical activity might induce exhaustion, potentially causing heat cramps.It is crucial to understand that heat index figures are for shade and gentle wind conditions. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'real feel' or 'felt air temperature', reflects the feeling of heat when considering both air temperature and humidity. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Humidity
The months with the highest humidity in Changshu, China, are July through September, with an average relative humidity of 81%.Rainfall
In Changshu, in September, during 15.5 rainfall days, 51mm (2.01") of precipitation is typically accumulated. In Changshu, China, during the entire year, the rain falls for 143.2 days and collects up to 487mm (19.17") of precipitation.Snowfall
April through November are months without snowfall in Changshu.Daylight
In September, the average length of the day in Changshu is 12h and 22min.On the first day of the month, sunrise is at 05:32 and sunset at 18:21. On the last day of September, sunrise is at 05:50 and sunset at 17:43 CST.
Sunshine
The average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September in Changshu is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 5 during September leads to these advisories:
Act with care - The need to guard against sun damage is communicated. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Changshu, China
- Average high temperature in September: 27.1°C
The warmest month (with the highest average high temperature) is August (31.8°C).
The month with the lowest average high temperature is January (8°C).
- Average low temperature in September: 20°C
The month with the highest average low temperature is August (24.7°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).
Average pressure in September
Changshu, China
- Average pressure in September: 1012.9mbar
The month with the highest atmospheric pressure is January (1027.4mbar).
The month with the lowest atmospheric pressure is July (1004.8mbar).
Average wind speed in September
Changshu, China
- Average wind speed in September: 10.6km/h
The windiest month (with the highest average wind speed) is February (12.9km/h).
The calmest month (with the lowest average wind speed) is September (10.6km/h).
Average humidity in September
Changshu, China
- Average humidity in September: 81%
The months with the highest relative humidity are July, August and September (81%).
The month with the lowest relative humidity is December (64%).
Average rainfall in September
Changshu, China
- Average rainfall in September: 51mm
The wettest month (with the highest rainfall) is July (98mm).
The driest month (with the least rainfall) is October (17mm).
Average rainfall days in September
Changshu, China
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is December (7.3 days).
Average snowfall in September
Changshu, China
- Average snowfall in September: 0mm
The month with the highest snowfall is February (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Changshu, China
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Changshu, China
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Changshu, China
- Average sunshine days in September: 11.2 days
The month with the most sunshine days is December (22.1 days).
The month with the least sunshine days is July (9 days).
Average UV index in September
Changshu, China
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Changshu, China
- Average cloud cover in September: 47
The month with the most cloud cover is June (Cloud cover 49).
The month with the least cloud cover is December (Cloud cover 34).
Average visibility in September
Changshu, China
- Average visibility in September: 8km
The months with the highest visibility are March, October, November and December (10km).
The months with the lowest visibility are July, August and September (8km).
