Climate averages 1991–2020
Haimen weather
in September.
A hot, 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 hot month in Haimen: daytime highs average 28.9°C and nights cool to about 24.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 166 mm of rain on roughly 15 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 18 min on an average September day.
The nearest other city in this atlas is Shantou (19 km away). In September its highs average 29.2°C, about as warm as Haimen, with 156 mm of rain.
Among the 884 cities listed in China, Haimen ranks joint 149th of 884 for the warmest September highs and joint 779th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Haimen is 3.2°C warmer than that mean.
From September to October, average highs fall by 2.4°C to 26.5°C, and monthly rainfall falls from 166 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
Haimen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.4°C12.3°C | 12.3°C | 30 | 4.8 | 10.911 h |
| February | 18.1°C13.1°C | 13.1°C | 42 | 6.9 | 11.411 h |
| March | 20.5°C15.5°C | 15.5°C | 62 | 9.6 | 12.012 h |
| April | 23.9°C19.2°C | 19.2°C | 106 | 11.9 | 12.713 h |
| May | 26.8°C22.7°C | 22.7°C | 191 | 17.3 | 13.213 h |
| June | 28.8°C25.3°C | 25.3°C | 246 | 22.0 | 13.514 h |
| July | 29.8°C26.0°C | 26.0°C | 210 | 20.5 | 13.413 h |
| August | 29.7°C25.8°C | 25.8°C | 261 | 22.1 | 12.913 h |
| September, selected | 28.9°C24.9°C | 24.9°C | 166 | 15.2 | 12.312 h |
| October | 26.5°C22.0°C | 22.0°C | 54 | 5.4 | 11.612 h |
| November | 23.3°C18.2°C | 18.2°C | 54 | 5.0 | 11.011 h |
| December | 19.2°C14.0°C | 14.0°C | 39 | 4.7 | 10.711 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
- Shantou in SeptemberChina · 19 kmHigh 29.2°C · Low 24.7°C · 156 mm rain
- Chenghua in SeptemberChina · 34 kmHigh 29.0°C · Low 24.5°C · 151 mm rain
- Huicheng (Guangdong), China in SeptemberChina · 37 kmHigh 29.0°C · Low 24.9°C · 173 mm rain
- Jieyang in SeptemberChina · 46 kmHigh 30.1°C · Low 23.5°C · 166 mm rain
- Puning in SeptemberChina · 47 kmHigh 29.8°C · Low 23.6°C · 179 mm rain
- Chaozhou in SeptemberChina · 51 kmHigh 29.8°C · Low 23.3°C · 187 mm rain
- Jiazi in SeptemberChina · 65 kmHigh 29.2°C · Low 25.0°C · 192 mm rain
- Huanggang (Guangdong), China in SeptemberChina · 67 kmHigh 29.5°C · Low 23.9°C · 177 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 Haimen) is explained once on the Haimen year overview and on the Sources, method and limits page.