Climate averages 1991–2020
Haikou weather
in September.
A hot, very wet month: the 5th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Haikou: daytime highs average 29.3°C and nights cool to about 25.7°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 218 mm of rain on roughly 19 days, which makes September a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 16 min on an average September day.
The nearest other city in this atlas is Qiongshan (3 km away). In September its highs average 29.1°C, about as warm as Haikou, with 218 mm of rain.
Among the 884 cities listed in China, Haikou ranks joint 121st of 884 for the warmest September highs and joint 865th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Haikou is 3.6°C warmer than that mean.
From September to October, average highs fall by 2.0°C to 27.3°C, and monthly rainfall falls from 218 mm to 161 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
Haikou climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 20.7°C17.2°C | 17.2°C | 30 | 6.1 | 11.111 h |
| February | 22.3°C18.2°C | 18.2°C | 31 | 6.2 | 11.511 h |
| March | 25.5°C20.6°C | 20.6°C | 35 | 7.2 | 12.012 h |
| April | 28.4°C23.4°C | 23.4°C | 71 | 11.7 | 12.613 h |
| May | 30.3°C25.6°C | 25.6°C | 123 | 17.4 | 13.113 h |
| June | 31.3°C26.8°C | 26.8°C | 148 | 17.1 | 13.313 h |
| July | 31.4°C26.9°C | 26.9°C | 170 | 16.9 | 13.213 h |
| August | 30.5°C26.5°C | 26.5°C | 231 | 20.5 | 12.813 h |
| September, selected | 29.3°C25.7°C | 25.7°C | 218 | 18.7 | 12.312 h |
| October | 27.3°C24.2°C | 24.2°C | 161 | 12.8 | 11.712 h |
| November | 25.0°C22.0°C | 22.0°C | 43 | 7.5 | 11.211 h |
| December | 21.6°C18.7°C | 18.7°C | 35 | 5.8 | 10.911 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
- Qiongshan in SeptemberChina · 3 kmHigh 29.1°C · Low 25.6°C · 218 mm rain
- Xucheng in SeptemberChina · 38 kmHigh 29.4°C · Low 25.1°C · 217 mm rain
- Wenchang in SeptemberChina · 72 kmHigh 29.9°C · Low 24.9°C · 247 mm rain
- Qionghai in SeptemberChina · 89 kmHigh 29.5°C · Low 25.3°C · 243 mm rain
- Nada in SeptemberChina · 99 kmHigh 29.7°C · Low 23.4°C · 212 mm rain
- Dacheng in SeptemberChina · 116 kmHigh 29.8°C · Low 23.3°C · 212 mm rain
- Sandu in SeptemberChina · 121 kmHigh 29.4°C · Low 25.5°C · 192 mm rain
- Yaxing in SeptemberChina · 131 kmHigh 29.4°C · Low 23.3°C · 203 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 Haikou) is explained once on the Haikou year overview and on the Sources, method and limits page.
Qiongshan lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.