Climate averages 1991–2020
Lanzhou weather
in September.
A warm, moderately wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Lanzhou: daytime highs average 22.3°C and nights cool to about 12.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 72 mm of rain on roughly 12 days, which makes September a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average September day.
The nearest other city in this atlas is Baiyin (62 km away). In September its highs average 20.4°C, 1.9°C cooler than Lanzhou, with 54 mm of rain.
Among the 884 cities listed in China, Lanzhou ranks joint 730th of 884 for the warmest September highs and joint 281st of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Lanzhou is 3.4°C cooler than that mean.
From September to October, average highs fall by 6.0°C to 16.3°C, and monthly rainfall falls from 72 mm to 41 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Lanzhou climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.7°C-8.1°C | -8.1°C | 4.2 | 1.8 | 10.010 h |
| February | 6.0°C-5.0°C | -5.0°C | 5.8 | 1.9 | 10.811 h |
| March | 12.8°C0.0°C | 0.0°C | 13 | 3.8 | 11.912 h |
| April | 19.4°C5.5°C | 5.5°C | 24 | 5.6 | 13.113 h |
| May | 23.8°C10.7°C | 10.7°C | 44 | 8.0 | 14.114 h |
| June | 27.7°C15.3°C | 15.3°C | 57 | 9.0 | 14.615 h |
| July | 29.2°C17.6°C | 17.6°C | 86 | 12.3 | 14.414 h |
| August | 27.5°C16.7°C | 16.7°C | 100 | 13.2 | 13.514 h |
| September, selected | 22.3°C12.3°C | 12.3°C | 72 | 11.7 | 12.412 h |
| October | 16.3°C6.1°C | 6.1°C | 41 | 9.0 | 11.311 h |
| November | 9.6°C-0.7°C | -0.7°C | 7.7 | 2.5 | 10.310 h |
| December | 3.4°C-5.7°C | -5.7°C | 2.0 | 0.7 | 9.810 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Baiyin in SeptemberChina · 62 kmHigh 20.4°C · Low 10.6°C · 54 mm rain
- Linxia Chengguanzhen in SeptemberChina · 76 kmHigh 18.8°C · Low 9.4°C · 104 mm rain
- Dingxi in SeptemberChina · 89 kmHigh 18.9°C · Low 9.2°C · 84 mm rain
- Nianbo in SeptemberChina · 136 kmHigh 18.9°C · Low 9.8°C · 87 mm rain
- Tongren (Qinghai), China in SeptemberChina · 175 kmHigh 16.6°C · Low 7.2°C · 172 mm rain
- Luomen in SeptemberChina · 180 kmHigh 21.2°C · Low 12.7°C · 94 mm rain
- Pan’an in SeptemberChina · 185 kmHigh 21.3°C · Low 12.9°C · 94 mm rain
- Xinxing in SeptemberChina · 196 kmHigh 21.5°C · Low 13.2°C · 95 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Lanzhou) is explained once on the Lanzhou year overview and on the Sources, method and limits page.