Climate averages 1991–2020
Nanjing weather
in September.
A warm, moderately wet month: the 4th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Nanjing: daytime highs average 27.1°C and nights cool to about 19.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 81 mm of rain on roughly 8 days, which makes September a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 24 min on an average September day.
The nearest other city in this atlas is Zhenzhou (44 km away). In September its highs average 27.1°C, about as warm as Nanjing, with 85 mm of rain.
Among the 884 cities listed in China, Nanjing ranks joint 301st of 884 for the warmest September highs and joint 389th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Nanjing is 1.4°C warmer than that mean.
From September to October, average highs fall by 4.8°C to 22.3°C, and monthly rainfall falls from 81 mm to 54 mm.
The annual picture
September in context
Monthly rainfall
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
Nanjing climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.6°C-1.0°C | -1.0°C | 55 | 8.0 | 10.310 h |
| February | 10.3°C1.0°C | 1.0°C | 56 | 8.5 | 11.011 h |
| March | 15.0°C5.1°C | 5.1°C | 80 | 10.0 | 12.012 h |
| April | 21.0°C10.8°C | 10.8°C | 94 | 9.0 | 12.913 h |
| May | 25.7°C16.3°C | 16.3°C | 121 | 9.8 | 13.814 h |
| June | 28.6°C20.6°C | 20.6°C | 222 | 11.9 | 14.214 h |
| July | 31.4°C24.7°C | 24.7°C | 210 | 15.1 | 14.014 h |
| August | 30.9°C24.4°C | 24.4°C | 174 | 14.3 | 13.313 h |
| September, selected | 27.1°C19.7°C | 19.7°C | 81 | 8.3 | 12.412 h |
| October | 22.3°C13.7°C | 13.7°C | 54 | 6.3 | 11.411 h |
| November | 16.3°C7.3°C | 7.3°C | 53 | 6.8 | 10.611 h |
| December | 9.9°C1.1°C | 1.1°C | 34 | 5.6 | 10.110 h |
Rainfall is the average of the 30 separate monthly totals. A rain 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
- Zhenzhou in SeptemberChina · 44 kmHigh 27.1°C · Low 19.8°C · 85 mm rain
- Ma’anshan in SeptemberChina · 49 kmHigh 27.3°C · Low 20.1°C · 80 mm rain
- Chuzhou in SeptemberChina · 54 kmHigh 27.0°C · Low 19.4°C · 84 mm rain
- Zhenjiang in SeptemberChina · 66 kmHigh 26.9°C · Low 19.6°C · 86 mm rain
- Yangzhou in SeptemberChina · 72 kmHigh 26.9°C · Low 19.7°C · 89 mm rain
- Xiannü in SeptemberChina · 84 kmHigh 26.9°C · Low 19.5°C · 89 mm rain
- Wuhu in SeptemberChina · 85 kmHigh 27.6°C · Low 20.4°C · 78 mm rain
- Licheng, China in SeptemberChina · 97 kmHigh 27.4°C · Low 20.5°C · 81 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 Nanjing) is explained once on the Nanjing year overview and on the Sources, method and limits page.