Climate averages 1991–2020
Changshu weather
in September.
A warm, 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 Changshu: daytime highs average 27.3°C and nights cool to about 20.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 92 mm of rain on roughly 10 days, which makes September a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 23 min on an average September day.
The nearest other city in this atlas is Zhangjiagang (31 km away). In September its highs average 27.0°C, about as warm as Changshu, with 87 mm of rain.
Among the 884 cities listed in China, Changshu ranks joint 277th of 884 for the warmest September highs and joint 517th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Changshu is 1.6°C warmer than that mean.
From September to October, average highs fall by 4.6°C to 22.7°C, and monthly rainfall falls from 92 mm to 51 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
Changshu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.4°C-0.1°C | -0.1°C | 60 | 8.2 | 10.310 h |
| February | 10.6°C1.5°C | 1.5°C | 58 | 8.4 | 11.011 h |
| March | 14.8°C5.2°C | 5.2°C | 83 | 10.7 | 12.012 h |
| April | 20.6°C10.4°C | 10.4°C | 96 | 9.7 | 12.913 h |
| May | 25.5°C16.0°C | 16.0°C | 118 | 9.9 | 13.714 h |
| June | 28.3°C20.4°C | 20.4°C | 245 | 13.1 | 14.214 h |
| July | 31.8°C24.9°C | 24.9°C | 193 | 14.7 | 14.014 h |
| August | 31.3°C24.8°C | 24.8°C | 172 | 14.9 | 13.313 h |
| September, selected | 27.3°C20.2°C | 20.2°C | 92 | 9.6 | 12.412 h |
| October | 22.7°C14.3°C | 14.3°C | 51 | 6.1 | 11.411 h |
| November | 17.2°C8.5°C | 8.5°C | 54 | 7.1 | 10.611 h |
| December | 10.7°C2.1°C | 2.1°C | 40 | 6.1 | 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
- Zhangjiagang in SeptemberChina · 31 kmHigh 27.0°C · Low 20.3°C · 87 mm rain
- Kunshan in SeptemberChina · 36 kmHigh 27.2°C · Low 20.7°C · 96 mm rain
- Taicang in SeptemberChina · 40 kmHigh 27.1°C · Low 20.9°C · 96 mm rain
- Suzhou in SeptemberChina · 41 kmHigh 27.3°C · Low 21.1°C · 95 mm rain
- Wuxi in SeptemberChina · 44 kmHigh 27.4°C · Low 20.6°C · 88 mm rain
- Nantong in SeptemberChina · 45 kmHigh 26.8°C · Low 20.6°C · 94 mm rain
- Songling in SeptemberChina · 50 kmHigh 27.4°C · Low 21.0°C · 91 mm rain
- Jiangyin in SeptemberChina · 54 kmHigh 27.1°C · Low 20.0°C · 89 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 Changshu) is explained once on the Changshu year overview and on the Sources, method and limits page.