Lanzhou weather in September
In September, Lanzhou has an average high of 24 °C75 °F and an average low of 11 °C52 °F, with about 61 mm2.4 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 5.1 °C9.2 °F cooler on average and drier by 25 mm1.0 in. Compared with October, September is 6.1 °C11.1 °F warmer on average and wetter by 31 mm1.2 in. Daylight lasts about 12.4 hours around the middle of the month. Average relative humidity is 66% and the average cloud amount 67%.
Is September a good time to visit Lanzhou?
Yes — September is one of the most comfortable months to visit Lanzhou 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 Lanzhou 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
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Lanzhou | 2475 | 1152 | 612.4 |
| Baiyin | 2272 | 949 | 481.9 |
| Linxia Chengguanzhen | 2272 | 949 | 793.1 |
| Dingxi | 2170 | 947 | 692.7 |
| Nianbo | 2170 | 847 | 763.0 |
| Tongren | 2068 | 643 | 883.5 |
| Xining | 2068 | 744 | 833.3 |
| Zhongwei | 2577 | 1254 | 351.4 |
| Qiaotou | 1865 | 642 | 873.4 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Zhongwei; cooler: Baiyin, Linxia Chengguanzhen, Dingxi and Nianbo.
Other months in Lanzhou
- January3 °C38 °F / −8 °C17 °F
- February7 °C45 °F / −5 °C23 °F
- March13 °C56 °F / −1 °C31 °F
- April20 °C68 °F / 4 °C40 °F
- May25 °C77 °F / 10 °C50 °F
- June29 °C84 °F / 15 °C59 °F
- July31 °C88 °F / 17 °C62 °F
- August29 °C85 °F / 16 °C61 °F
- September24 °C75 °F / 11 °C52 °F
- October18 °C65 °F / 5 °C41 °F
- November11 °C51 °F / −2 °C29 °F
- December4 °C40 °F / −7 °C19 °F
Frequently asked questions
How warm is Lanzhou in September?
In September the average high in Lanzhou is 24 °C (75 °F) and the average low is 11 °C (52 °F).
Does it rain a lot in Lanzhou in September?
On average about 61 mm (2.4 in) of precipitation falls in September; it ranks 4th of the 12 months.
Is September the warmest month in Lanzhou?
No. The warmest month in Lanzhou is July, with an average high of 31 °C (88 °F). The coldest month is January, with an average low of -8 °C (17 °F).
How long is the day in Lanzhou in September?
In the middle of September the day in Lanzhou lasts about 12.4 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Lanzhou in September?
The average relative humidity in September is about 66%. This is a long-term average for the whole day.
How cloudy is Lanzhou in September?
On average about 67% 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 2,068 m, while Lanzhou lies at about 1,521 m. Temperatures on this page were therefore adjusted by +3.6 °C6.4 °F using the standard lapse rate of 6.5 °C per 1,000 m.