Climate averages 1991–2020
Chongming weather
in September.
A warm, wet month: the 3rd warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Chongming: daytime highs average 26.0°C and nights cool to about 22.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 111 mm of rain on roughly 10 days, which makes September a wet month (the 8th 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 Huilong (22 km away). In September its highs average 25.9°C, about as warm as Chongming, with 109 mm of rain.
Among the 884 cities listed in China, Chongming ranks joint 511th of 884 for the warmest September highs and joint 617th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Chongming is 0.3°C warmer than that mean.
From September to October, average highs fall by 4.5°C to 21.4°C, and monthly rainfall falls from 111 mm to 65 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
Chongming climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.4°C2.7°C | 2.7°C | 67 | 8.8 | 10.310 h |
| February | 8.6°C3.6°C | 3.6°C | 69 | 8.9 | 11.011 h |
| March | 12.2°C6.8°C | 6.8°C | 105 | 11.4 | 12.012 h |
| April | 17.2°C11.7°C | 11.7°C | 106 | 10.5 | 12.913 h |
| May | 22.2°C17.1°C | 17.1°C | 122 | 9.6 | 13.714 h |
| June | 25.4°C21.4°C | 21.4°C | 255 | 13.3 | 14.214 h |
| July | 29.4°C25.7°C | 25.7°C | 153 | 12.4 | 14.014 h |
| August | 29.4°C26.0°C | 26.0°C | 153 | 13.5 | 13.313 h |
| September, selected | 26.0°C22.4°C | 22.4°C | 111 | 10.1 | 12.412 h |
| October | 21.4°C17.4°C | 17.4°C | 65 | 6.1 | 11.411 h |
| November | 16.2°C11.6°C | 11.6°C | 66 | 7.8 | 10.611 h |
| December | 10.1°C5.3°C | 5.3°C | 51 | 6.8 | 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
- Huilong in SeptemberChina · 22 kmHigh 25.9°C · Low 22.2°C · 109 mm rain
- Chengqiao in SeptemberChina · 29 kmHigh 26.4°C · Low 21.5°C · 101 mm rain
- Baoshan in SeptemberChina · 30 kmHigh 26.7°C · Low 21.5°C · 104 mm rain
- Yanghang in SeptemberChina · 37 kmHigh 26.7°C · Low 21.4°C · 106 mm rain
- Luodian in SeptemberChina · 41 kmHigh 26.9°C · Low 21.2°C · 100 mm rain
- Yangpu in SeptemberChina · 43 kmHigh 26.7°C · Low 21.5°C · 106 mm rain
- Shanghai in SeptemberChina · 50 kmHigh 26.8°C · Low 21.4°C · 106 mm rain
- Jiading in SeptemberChina · 50 kmHigh 27.0°C · Low 21.0°C · 100 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 Chongming) is explained once on the Chongming year overview and on the Sources, method and limits page.