Suzhou weather in September
In September, Suzhou has an average high of 28 °C82 °F and an average low of 17 °C63 °F, with about 82 mm3.2 in of precipitation. It is the 4th warmest month of the year and ranks 4th for precipitation.
How September compares with other months
Compared with August, September is 4.6 °C8.3 °F cooler on average and drier by 78 mm3.1 in. Compared with October, September is 6 °C10.9 °F warmer on average and wetter by 40 mm1.6 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 75% and the average cloud amount 62%.
Is September a good time to visit Suzhou?
Yes — September is one of the most comfortable months to visit Suzhou by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in September
For Suzhou in September, pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
September in nearby places
Other months in Suzhou
- January6 °C42 °F / −4 °C24 °F
- February10 °C49 °F / −2 °C28 °F
- March16 °C61 °F / 2 °C36 °F
- April23 °C73 °F / 9 °C48 °F
- May28 °C83 °F / 15 °C59 °F
- June32 °C89 °F / 20 °C68 °F
- July32 °C90 °F / 24 °C74 °F
- August31 °C88 °F / 23 °C73 °F
- September28 °C82 °F / 17 °C63 °F
- October22 °C72 °F / 10 °C50 °F
- November15 °C59 °F / 3 °C37 °F
- December8 °C46 °F / −3 °C26 °F
Frequently asked questions
How warm is Suzhou in September?
In September the average high in Suzhou is 28 °C (82 °F) and the average low is 17 °C (63 °F).
Does it rain a lot in Suzhou in September?
On average about 82 mm (3.2 in) of precipitation falls in September; it ranks 4th of the 12 months.
Is September the warmest month in Suzhou?
No. The warmest month in Suzhou is July, with an average high of 32 °C (90 °F). The coldest month is January, with an average low of -4 °C (24 °F).
How long is the day in Suzhou in September?
In the middle of September the day in Suzhou 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 Suzhou in September?
The average relative humidity in September is about 75%. Combined with warm days, it can feel muggy.
How cloudy is Suzhou in September?
On average about 62% 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.