Sanya weather by month
Sanya runs from about 22°C in December to 29°C in August, with September the wettest month at 348 mm.
warmest month
August
29°C
coolest month
December
22°C
wettest month
September
348 mm
worst air month
January
19 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 22°C | 4 mm | 310 h | 19 |
| February | 23°C | 9 mm | 296 h | 15 |
| March | 25°C | 22 mm | 327 h | 16 |
| April | 28°C | 27 mm | 354 h | 16 |
| May | 28°C | 235 mm | 296 h | 12 |
| June | 29°C | 228 mm | 315 h | 12 |
| July | 28°C | 345 mm | 322 h | 9 |
| August | 29°C | 82 mm | 358 h | 11 |
| September | 28°C | 348 mm | 245 h | 9 |
| October | 27°C | 253 mm | 293 h | 10 |
| November | 25°C | 42 mm | 309 h | 16 |
| December | 22°C | 5 mm | 248 h | 15 |
About 3,673 hours of sun a year. Roughly 151 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.