Sanya weather in September
September in Sanya: hot, soaked, with clean air — fine if you can take 21 rainy days.
#10 of 12 months in Sanya · #629 of 897 destinations to visit in September · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Sanya in September
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Sanya climate normals — September
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Rainfall | 233 mm / 9.2 in | ⛈ soaked |
| Rainy days | 21 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 25°C / 77°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12.2 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sanya in September — FAQ
- Is September a good time to visit Sanya?
- September in Sanya: hot, soaked, with clean air — fine if you can take 21 rainy days. It ranks #10 of 12 months for Sanya on SeasonMap's comfort score (73/100).
- What is the weather like in Sanya in September?
- In September, Sanya averages a daily high of 30.1°C and a low of 25.7°C, with about 233.1 mm of rain over roughly 21.2 rainy days.
- What is the air quality in Sanya in September?
- Sanya has a mean US Air Quality Index of about 41 in September.