Climate averages 1991–2020
Sanya weather
in September.
A hot, very wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Sanya: daytime highs average 29.5°C and nights cool to about 25.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 258 mm of rain on roughly 22 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 15 min on an average September day.
The nearest other city in this atlas is Wuzhishan (59 km away). In September its highs average 29.1°C, about as warm as Sanya, with 248 mm of rain.
Among the 884 cities listed in China, Sanya ranks joint 106th of 884 for the warmest September highs and 879th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Sanya is 3.8°C warmer than that mean.
From September to October, average highs fall by 1.1°C to 28.4°C, and monthly rainfall falls from 258 mm to 182 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
Sanya climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 24.1°C18.5°C | 18.5°C | 12 | 2.4 | 11.211 h |
| February | 25.1°C19.5°C | 19.5°C | 9.9 | 2.5 | 11.512 h |
| March | 27.2°C21.9°C | 21.9°C | 18 | 3.8 | 12.012 h |
| April | 29.2°C24.4°C | 24.4°C | 53 | 8.6 | 12.513 h |
| May | 30.3°C26.0°C | 26.0°C | 139 | 18.9 | 13.013 h |
| June | 30.4°C26.7°C | 26.7°C | 212 | 22.2 | 13.213 h |
| July | 30.0°C26.4°C | 26.4°C | 280 | 23.0 | 13.113 h |
| August | 29.9°C26.1°C | 26.1°C | 261 | 24.3 | 12.713 h |
| September, selected | 29.5°C25.4°C | 25.4°C | 258 | 22.3 | 12.312 h |
| October | 28.4°C24.0°C | 24.0°C | 182 | 14.0 | 11.712 h |
| November | 26.9°C22.0°C | 22.0°C | 54 | 5.6 | 11.311 h |
| December | 24.6°C19.3°C | 19.3°C | 26 | 3.0 | 11.111 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
- Wuzhishan in SeptemberChina · 59 kmHigh 29.1°C · Low 23.4°C · 248 mm rain
- Wanning in SeptemberChina · 110 kmHigh 29.1°C · Low 25.7°C · 287 mm rain
- Basuo in SeptemberChina · 130 kmHigh 29.4°C · Low 25.4°C · 264 mm rain
- Yaxing in SeptemberChina · 135 kmHigh 29.4°C · Low 23.3°C · 203 mm rain
- Dacheng in SeptemberChina · 140 kmHigh 29.8°C · Low 23.3°C · 212 mm rain
- Nada in SeptemberChina · 141 kmHigh 29.7°C · Low 23.4°C · 212 mm rain
- Qionghai in SeptemberChina · 149 kmHigh 29.5°C · Low 25.3°C · 243 mm rain
- Sandu in SeptemberChina · 173 kmHigh 29.4°C · Low 25.5°C · 192 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 Sanya) is explained once on the Sanya year overview and on the Sources, method and limits page.