Xi'an weather in September
September in Xi'an: warm, soaked, with poor air quality — a great time to visit.
#5 of 12 months in Xi'an · #370 of 604 destinations to visit in September · comfort 76/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Xi'an climate normals — September
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 154 mm / 6.1 in | ⛈ soaked |
| Rainy days | 11 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 16°C / 60°F | |
| Sunshine | 7.5 h/day | |
| Daylight | 12.4 h | |
| Wind | 8 km/h / 5 mph | |
| Air quality (US AQI) | 112 | 😷 poor |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Xi'an?
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Xi'an in September — FAQ
- Is September a good time to visit Xi'an?
- September in Xi'an: warm, soaked, with poor air quality — a great time to visit. It ranks #5 of 12 months for Xi'an on SeasonMap's comfort score (76/100).
- What is the weather like in Xi'an in September?
- In September, Xi'an averages a daily high of 24.9°C and a low of 16.6°C, with about 153.8 mm of rain over roughly 11.4 rainy days.
- What is the air quality in Xi'an in September?
- Xi'an has a mean US Air Quality Index of about 112 in September.