Kunshan weather in September
In September, Kunshan has an average high of 27 °C81 °F and an average low of 21 °C70 °F, with about 129 mm5.1 in of precipitation. It is the 3rd warmest month of the year and ranks 4th for precipitation.
How September compares with other months
Compared with August, September is 3.9 °C6.9 °F cooler on average and drier by 29 mm1.1 in. Compared with October, September is 5.2 °C9.4 °F warmer on average and wetter by 57 mm2.2 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 79% and the average cloud amount 63%.
Is September a good time to visit Kunshan?
September is not among the most comfortable months by our comfort score: it is fairly wet (129 mm5.1 in) and it is humid (79%). The most comfortable months in Kunshan are May and October.
What to wear in September
For Kunshan in September, pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Kunshan | 2781 | 2170 | 1295.1 |
| Suzhou | 2882 | 2067 | 1164.6 |
| Shanghai | 2882 | 2170 | 1365.4 |
| Baoshan | 2781 | 2170 | 1295.1 |
| Wuxi | 2882 | 2069 | 1104.3 |
| Zhangjiagang | 2882 | 1966 | 1094.3 |
| Jiaxing | 2883 | 2069 | 1244.9 |
| Nantong | 2882 | 1966 | 1094.3 |
| Chongming | 2679 | 2374 | 1305.1 |
Nearby places that are more than 1 °C1.8 °F cooler: Zhangjiagang.
Other months in Kunshan
- January8 °C46 °F / 1 °C33 °F
- February9 °C49 °F / 2 °C35 °F
- March14 °C57 °F / 5 °C41 °F
- April19 °C67 °F / 10 °C50 °F
- May25 °C76 °F / 16 °C61 °F
- June28 °C82 °F / 21 °C69 °F
- July31 °C88 °F / 25 °C77 °F
- August31 °C88 °F / 25 °C77 °F
- September27 °C81 °F / 21 °C70 °F
- October23 °C73 °F / 16 °C60 °F
- November17 °C63 °F / 10 °C50 °F
- December10 °C50 °F / 3 °C38 °F
Frequently asked questions
How warm is Kunshan in September?
In September the average high in Kunshan is 27 °C (81 °F) and the average low is 21 °C (70 °F).
Does it rain a lot in Kunshan in September?
On average about 129 mm (5.1 in) of precipitation falls in September; it ranks 4th of the 12 months.
Is September the warmest month in Kunshan?
No. The warmest month in Kunshan is July, with an average high of 31 °C (88 °F). The coldest month is January, with an average low of 1 °C (33 °F).
How long is the day in Kunshan in September?
In the middle of September the day in Kunshan lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Kunshan in September?
The average relative humidity in September is about 79%. Combined with warm days, it can feel muggy.
How cloudy is Kunshan in September?
On average about 63% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.