Hangzhou weather in September
In September, Hangzhou has an average high of 29 °C84 °F and an average low of 20 °C68 °F, with about 129 mm5.1 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 4.2 °C7.5 °F cooler on average and drier by 48 mm1.9 in. Compared with October, September is 5.6 °C10 °F warmer on average and wetter by 55 mm2.2 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 80% and the average cloud amount 66%.
Is September a good time to visit Hangzhou?
September is not among the most comfortable months by our comfort score: it is hot (average high 29 °C84 °F), it is fairly wet (129 mm5.1 in) and it is humid (80%). The most comfortable months in Hangzhou are October.
What to wear in September
For Hangzhou 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
Other months in Hangzhou
- January8 °C47 °F / −1 °C30 °F
- February11 °C52 °F / 1 °C34 °F
- March16 °C61 °F / 5 °C41 °F
- April22 °C72 °F / 11 °C51 °F
- May27 °C81 °F / 16 °C61 °F
- June30 °C86 °F / 21 °C69 °F
- July33 °C91 °F / 25 °C77 °F
- August33 °C91 °F / 24 °C76 °F
- September29 °C84 °F / 20 °C68 °F
- October24 °C75 °F / 13 °C56 °F
- November18 °C64 °F / 7 °C45 °F
- December11 °C51 °F / 1 °C33 °F
Frequently asked questions
How warm is Hangzhou in September?
In September the average high in Hangzhou is 29 °C (84 °F) and the average low is 20 °C (68 °F).
Does it rain a lot in Hangzhou 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 Hangzhou?
No. The warmest month in Hangzhou is July, with an average high of 33 °C (91 °F). The coldest month is January, with an average low of -1 °C (30 °F).
How long is the day in Hangzhou in September?
In the middle of September the day in Hangzhou 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 Hangzhou in September?
The average relative humidity in September is about 80%. Combined with warm days, it can feel muggy.
How cloudy is Hangzhou in September?
On average about 66% 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.
The grid cell’s average elevation is 71 m, while Hangzhou lies at about 12 m. Temperatures on this page were therefore adjusted by +0.4 °C0.7 °F using the standard lapse rate of 6.5 °C per 1,000 m.